Vegetable Casserole Recipe (2024)

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Vegetable Casserole Recipe (1)

posted by Chef Lindsey

on Nov 23, 2014, Updated Sep 25, 2023

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Creamy, cheesy, and flavorful, this easy vegetable casserole recipe is made with thawed frozen veggies for the easiest hearty veggie side dish with a surprisingly complex flavor. Only 5 ingredients and 5 minutes of prep time!

Vegetable Casserole Recipe (2)

This vegetable casserole recipe is made with thawed frozen vegetables for the ultimate prep shortcut. As it bakes, the flavors meld and it tastes like it took hours! Plus, there’s a little salty crunch from the fried onions that will have your guests fighting over seconds.

Try this casserole instead of the usual green bean casserole at your next holiday feast or whip it up any day of the week for a hearty, flavorful easy side dish recipe. You really won’t believe how easy it is. This means more time for white cheddar mac and cheese, sweet potato casserole and scalloped potatoes! Or, if you are like me, that means time to make two more pie recipes!

Table of Contents

  • Why you will love this dish:
  • Professional Tips for Making Broccoli Cheese Casserole:
  • Ingredients
  • Variations
  • How to Make this Vegetable Casserole:
  • Chef Lindsey’s Recipe Tip
  • Frequently Asked Questions
  • Vegetable Casserole Recipe
  • Before You Go!

Why you will love this dish:

  • It requires only 5 ingredients and 5 minutes of prep time. I wasn’t kidding when I said this was an easy dish! You’ll be ready to pop this casserole in the oven after only 5 minutes of prep.
  • This recipe easily scales up. It is easy to mix and bake a large batch of this easy vegetable casserole. Bake it in one large dish or divide it between multiple dishes. Just select the “2x” or “3x” buttons in the recipe card below to increase the number of portions.
  • It’s a versatile side dish recipe. Serve it with Thanksgiving turkey, maple mashed sweet potatoes, and my easy dinner rolls! The creaminess of the dish also pairs beautifully with a simple side salad. Serve it with a roasted chicken or my foolproof rosemary chicken and this easy hashbrown casserole for an easy weeknight meal.
Vegetable Casserole Recipe (3)

Vegetable Casserole Recipe (4)

Professional Tips for Making Broccoli Cheese Casserole:

  • It is easiest to place the bag of frozen vegetables in the refrigerator the night before to thaw, but I have also thawed them in the microwave at 50% power in a pinch.
  • Be sure to drain any excess liquid from the vegetables before adding them to the casserole dish. Frozen vegetables can let off a good amount of moisture when defrosting or cooking, particularly if they have been in the freezer for a while.
  • If you know you’ll have leftovers, only add fried onions to the section you are going to eat right away. Add the remaining onions to the dish when reheating so they keep their crunch.

Ingredients

  • Mixed Frozen Vegetables: I use bags of frozen broccoli, carrots, and cauliflower in my vegetable casserole recipe, but you could certainly add other varieties. I used Trader Joe’s mixed veggies for this version. Every brand has a different size bag, so be sure to get enough.
  • Sour Cream: I use full-fat sour cream but low-fat can also be used. Sour cream adds extra creaminess and tanginess to the Swiss cheese mixed vegetable casserole.
  • Condensed Cream of Mushroom Soup: I use the organic Pacific brand cream of mushroom soup because I prefer the flavor and it has lower sodium than other brands, but you can use any brand you choose.
  • Swiss Cheese: Swiss Cheese comes in a wide variety of qualities and flavors. You can use pre-shredded cheese, but I love to go the extra mile and shred my own. I look for Emmental cheese, which is a Swiss cheese from the Emmental region in Switzerland. It has a richer, more robust flavor than other varieties.
  • Kosher Salt: Depending on the brand of soup you choose, you might need to add a little extra kosher salt to taste.Just like with my sweet potato casserole recipe with pecans, tasting along the way is the way to get the saltiness you desire!
  • Black Pepper: A bit of freshly ground black pepper adds a nice kick to this recipe.
  • French Fried Onions: French Fried Onions are a magical thing. Salty, crispy fried onions in a can! Add right before serving or they will get soggy.

See the recipe card for full information on ingredients and quantities.

Variations

  • Ritz Crackers: If you aren’t a fan of fried onions, you can top the casserole with crushed Ritz crackers or any brand of butter crackers instead. It will provide the same crunch without the onion flavor.
  • Different Cheese: You can try any variety of good melting cheese in this recipe. Cheddar cheese, mozzarella, Gruyère, and fontina are all great options.
  • Corn Casserole: Feel free to add some frozen corn to this dish as well for added texture and flavor.

How to Make this Vegetable Casserole:

Use these instructions to make the perfect veggie casserole every time! Further details and measurements can be found in the recipe card below!

Step 1: Preheat your oven to 350°F.

Step 2: Combine the thawed vegetables, soup, ½ cup cheese, sour cream, and pepper. Pour into a 1-quart casserole dish.

Depending on the brand of soup you choose, you might need to add a little extra kosher salt to taste.

Step 3: Bake for 30 minutes covered.

Step 4: Top with remaining cheese and onions and bake uncovered for 5 minutes longer. Taste for seasoning, add salt if needed, and serve.

For the most impressive presentation, bring the whole casserole dish to the table so your guests can see the melty cheese lift out of the dish.

Vegetable Casserole Recipe (5)

Chef Lindsey’s Recipe Tip

Frozen vegetables are a great way to increase your vegetable intake without the prep work of fresh vegetables. Frozen vegetables are typically flash-frozen at the peak of their nutrient density, allowing them to provide the same level of nutrition you would get from freshly picked vegetables!

Frequently Asked Questions

How do you store vegetable casserole?

Refrigerate leftover vegetable casserole in an airtight container in the fridge for up to 7 days. Only add the fried onions when ready to serve the dish, as they will get soggy in the fridge. You can freeze this dish for up to 6 months. Transfer to a freezer-safe storage container or zip-top baggie after it has cooled and then place in the freezer.

How do you reheat vegetable casserole?

To reheat from refrigerated, place in a covered, oven-safe dish in a preheated 350°F oven. Bake until hot and bubbly. Top with crispy onions and serve. To reheat from frozen, allow the casserole to thaw in the refrigerator overnight and follow the instructions above, or cover and bake from frozen in an oven-safe dish. It will take longer but will be equally delicious.

Do you need to cook the vegetables before adding them to this vegetable casserole recipe?

Because this recipe uses frozen, defrosted vegetables, they are already blanched, which means they are partially cooked. They will finish cooking while they are in the oven.

Can you make mixed vegetable casserole in advance?

You can make this Swiss Cheese Mixed Vegetable Casserole up to 3 days ahead of serving. I recommend mixing the filling and then covering and refrigerating unbaked. It can also be baked ahead of time and rewarmed according to the instructions above.

If you tried thisrecipeand loved it please leave a 🌟star ratingand let me know how it goes in the commentsbelow. I love hearing from you; your comments make my day!

Vegetable Casserole Recipe (6)

4.75 from 4 ratings

Vegetable Casserole

Creamy, cheesy, flavorful. 5 ingredients and 5 minute prep time: This casserole couldn’t be easier yet it has a surprisingly complex flavor!

Prep: 5 minutes mins

Cook: 30 minutes mins

Total: 35 minutes mins

Servings: 8 people

Ingredients

  • 16 oz frozen broccoli, carrots and cauliflower mix thawed and drained
  • 12 oz condensed cream of mushroom soup canned I use organic Pacific brand but you can use a standard 10 oz can too
  • 1 cup shredded Swiss cheese, divided 4 oz
  • cup sour cream
  • ¼ teaspoon ground black pepper
  • kosher salt to taste
  • 2.8 oz French fried onions

Instructions

  • Preheat your oven to 350°F.

  • Combine the thawed vegetables, soup, ½ cup cheese, sour cream, and pepper. Pour into a 1-quart casserole dish.

  • Bake for 30 minutes covered.

  • Top with remaining cheese and onions and bake uncovered for 5 minutes longer. Taste for seasoning, add salt if needed, and serve.

Video

Notes

Technique – It is easiest to place the bag of frozen vegetables in the refrigerator the night before to thaw, but I have also thawed them in the microwave at 50% power in a pinch.

Variations If you aren’t a fan of fried onions, you can top the casserole with crushed Ritz crackers or any brand of butter crackers instead.

Storage Refrigerate leftover vegetable casserole in an airtight container in the fridge for up to 7 days. Only add the fried onions when ready to serve the dish, as they will get soggy in the fridge. You can freeze this dish for up to 6 months.

Based on the original instructions, I gather this recipe was from Durkee Brand. I only barely modified it.Preparation time: 5 minutes. Makes 8 servings.

Nutrition

Calories: 197kcal | Carbohydrates: 15g | Protein: 8g | Fat: 12g | Saturated Fat: 6g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Cholesterol: 20mg | Sodium: 439mg | Potassium: 197mg | Fiber: 2g | Sugar: 1g | Vitamin A: 3052IU | Vitamin C: 6mg | Calcium: 146mg | Iron: 1mg

Course: Side Dish

Cuisine: American

Calories: 197

Like this? Leave a comment below!

Before You Go!

I hope you enjoyed this professional chef-tested recipe. Check out our other delicious, chef-developed easy side dish recipes!

Vegetable Casserole Recipe (7)

Hi, I’m Chef Lindsey!

I am the baker, recipe developer, writer, and photographer behind Chef Lindsey Farr. I believe in delicious homemade food and the power of dessert!

Leave a comment

  1. Can it be made ahead of time like the night before Thanksgiving.? I will not be using any fried onions or crackers. I’m doing a double batch. Thank you and really love this dish while the others have green beans casserole with fried onions.

    Reply

    1. Hi Donna! You can make this Swiss Cheese Mixed Vegetable Casserole up to 3 days ahead of serving, so the night before Thanksgiving would be no problem! I recommend mixing the filling and then covering and refrigerating unbaked. It can also be baked ahead of time and rewarmed. To reheat from refrigerated, place in a covered, oven-safe dish in a preheated 350°F oven. Bake until hot and bubbly. Can’t wait for you to enjoy!

      Reply

Vegetable Casserole Recipe (2024)

FAQs

What is the key to making a good casserole? ›

  1. Choose the right baking dish. If you're all about the crunchy topping, use a shallow dish. ...
  2. Undercook your pasta. ...
  3. Drain your meat. ...
  4. Beware of mushy vegetables. ...
  5. Know your cheeses. ...
  6. Master the art of casserole assembly. ...
  7. Don't skip the topping. ...
  8. Make it now, but bake it later.
Nov 1, 2021

Is it better to cook casserole the day before or? ›

Make-ahead meals (especially baked casseroles) are terrific because you can completely assemble them in advance and bake them just before serving. They're the ultimate comfort food as they come bubbling hot and delicious straight from the oven to the table to the delight of family and friends.

Do casseroles cook faster covered or uncovered? ›

Then, as the heat from the pot cooks the food, the heat passes into the air, creating steam. That steam is hot, and that heat goes out of your kitchen exhaust as waste. But when you put a lid on, the heat stays in the pot. It helps cook your food faster.

How do you make a casserole not soggy? ›

To prevent a soupy casserole, be sure to fully thaw any frozen vegetables in a colander over a bowl, and pat dry, squeeze excess moisture out of greens like spinach or chard, and quickly precook watery fresh vegetables like onions, mushrooms or squashes just until they release their moisture.

What is the main ingredient in a casserole? ›

In the United States, a casserole or hot dish is typically a baked food with three main components: pieces of meat (such as chicken or ground meat) or fish (such as tuna) or other protein (such as beans or tofu), various chopped or canned vegetables (such as green beans or peas), and a starchy binder (such as flour, ...

What are 5 components of a casserole? ›

Let's talk anatomy: A standard dinner casserole usually includes a protein, a starch, a vegetable, a sauce (or other binding ingredient), and cheese. But making a casserole is not an exact science, and you can definitely break away from this formula. Check out some fun side-dish casseroles and desserts below!

How long should a casserole be cooked for? ›

The time a casserole takes to cook will vary from 2-2½ hours for chuck, blade and thick flank, up to 4 hours for shin, leg and neck. Pork cuts for braising and casseroling normally take 1½ hours, and lamb much the same.

How can I improve my casserole flavor? ›

Sweet, salty, spicy, and acidic elements should blend well and complement each other. Add ingredients like caramelized onions, olives, or lemon zest to give your casserole a depth of flavor.

Why put foil on casserole dish? ›

It protects your food from drying out or burning and helps keep in the heat and moisture, ensuring a perfectly cooked meal. Loosely covering your dish with foil can prevent uneven browning while baking. However, tightly sealing your bakeware with foil is the way to go for more steam.

Do casseroles cook faster in glass or metal? ›

Heats up quickly and cools quickly: A metal baking pan heats up quickly in a hot oven, as metal is an excellent conductor of heat. Bakes more slowly than glass: Interestingly enough, however, metal pans bake things more slowly than glass pans do.

What temperature do you bake a casserole? ›

Casseroles should be baked in a moderately hot oven

But too hot, and it won't cook evenly without some parts of it scorching first, according to KitchenSeer. A great rule of thumb, the site states, is to bake a casserole above 300 degrees F and below 400 degrees F: 350 degrees F is a great sweet spot.

What temperature do you cook a casserole at? ›

An oven temperature of 350 degrees F and a cooking time of 20-30 minutes is suitable for reheating most casseroles, but you'll want to make sure that your internal temperature reaches 165, just like when you first prepared it.

How do you know when a casserole is done? ›

Always double check with a thermometer

The safest way to know if any casserole is cooked is to check it with a quick-read thermometer. If you don't have one, you should definitely invest in one, because it will save you a lot of trouble whether you're cooking meat, bread, or even baked potatoes.

What thickens a casserole? ›

The three main thickening agents for gravies are flour, cornflour and arrowroot. The first two are normally used in savoury dishes while arrowroot tends to be used in sweet dishes – that said, arrowroot will work in a savoury dish as it has no flavour.

Why did my rice not cook in my casserole? ›

Maybe you cooked it at too high of a temperature, evaporating the water long before the rice actually cooked. Maybe you took the lid off of the pot too early, letting the steam escape. Maybe you didn't add enough liquid to begin with.

What are three guidelines to follow when preparing casseroles? ›

Top tips for casseroles
  1. Cut your ingredients, such as meat, potatoes and parsnips, into similar-sized pieces to ensure they cook evenly. ...
  2. To save time – and washing up – use a flameproof, ovenproof casserole dish. ...
  3. Avoid adding flour after cooking or the raw flour taste will remain.

What are the 4 parts of a casserole? ›

Not every single casserole has all of them, but as a rule of thumb, here's what to look for: a starch, a binding agent or sauce, and a protein or vegetable. Many casseroles also have both vegetables and proteins, as well as a crunchy element to give some textural contrast, and cheese.

How can I improve my casserole? ›

Many casseroles seem to improve in flavour if kept overnight (cool them quickly and keep them in a refrigerator, by the way, once they're cold). This means it's quite possible to make two casseroles while the oven is in full swing, and keep one for the next day.

What are 3 possible advantages to preparing your own casseroles? ›

Why You Should Be Cooking More Casseroles
  1. They're versatile. For every set of tastebuds, there's a casserole to match. ...
  2. They can be nutritious. ...
  3. They're easy, from prep through cleanup. ...
  4. They feed a crowd. ...
  5. They're transportable and gift-able.

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