Frozen Vegetable Casserole Recipe - Practically Homemade (2024)

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Today I have a spin off of the original Green Bean Casserole. While the traditional version is fabulous, especially on a holiday {hello Thanksgiving!}, it is always a good idea to change things up. I have to admit that I hadn’t thought much about Green Bean Casserole until about a month ago when we were invited to a friend’s house for dinner. They served it with tri-tip and it was SO good. Of course, I couldn’t leave well enough alone and so I decided to come home and try to make a variation. Friends, it was a great idea because this Frozen Vegetable Casserole is delicious.

Do you love veggie side dishes? Try this BBQ Green Bean Casserole!

Frozen Vegetable Casserole Recipe - Practically Homemade (1)

The best part about Frozen Vegetable Casserole is that you can really customize it with whatever frozen vegetables you like or have on hand.

I stayed with Crispy French Fried Onions because you just can’t mess with some ingredients. However I did add Parmesan cheese and it was such a great addition.

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Ingredients needed to make Vegetable Casserole

  • Frozen Vegetables-I like to use a combination of broccoli, cauliflower and country trio {which is corn, carrots and green beans}. The great part is that you can customize the veggies to whatever you and your family enjoy.
  • Cream of Mushroom Soup-using a canned cream soup gives the sauce of this casserole a fabulous flavor and creamy texture.
  • Sour Cream-adding a bit of sour cream to a casserole like this is always a good idea. It gives the sauce body and also a bit of tang.
  • Seasonings-salt, pepper and garlic powder is all that it needs.
  • Crispy Fried Onions-is a holiday vegetable even complete without a crispy onion topping? I don’t think so either!
  • Parmesan Cheese-to give the topping a bit more flavor and texture. I promise you that this is an ingredient you don’t want to miss.

Making your Frozen Vegetable Casserole

Assembling this casserole couldn’t be simpler which is one of the wonderful things about a casserole like this.

1. In a large bowl combine the bags of frozen vegetables together. I love that the country trio has green beans in it. That way there is still a nod to the original.

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2. Combine the cream of mushroom soup with the sour cream in a separate bowl. Add the pepper, salt and garlic powder. Stir until everything is evenly combined.

Pour the soup mixture, along with 3/4 of the jar of Crispy Fried Onions to the frozen vegetables. Adding crispy onions to both the filling and topping gives everything great flavor. Stir until everything is evenly combined and coated.

Pour the mixture into your baking dish that has been sprayed with nonstick cooking spray.

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3. Top the vegetable mixture with a hearty layer of Parmesan cheese. Making sure that it is evenly distributed over the top.

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4. The final step is to top with the rest of the Crispy Fried Onions. Bake in a 350 degree oven for 40 minutes or until the top is golden brown and the filling is bubbly.

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Recipe Variations:

Vegetables-use any kind of frozen vegetables that you love. You can also use fresh if you would rather. They will just need to be steamed in the microwave for a couple of minutes before using.

Soup-cream of mushroom soup is traditional but cream of chicken, cream of celery or even cheddar cheese soup would all work wonderfully.

Toppings-if Crispy Fried Onions and Parmesan Cheese aren’t something you like then try other items. Crushed Ritz crackers and shredded cheddar or even Panko bread crumbs with shredded pepper jack would be dreamy.

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Frequently Asked Questions:

Can I use fresh instead of frozen vegetables?

Absolutely! I would suggest steaming the fresh vegetables in the microwave for a couple of minutes before adding them to the casserole first.

This will soften them slightly and ensure that the fresh vegetables will cook through.

Can this Frozen Vegetable Casserole be made in the Crock Pot?

Yes, this Frozen Vegetable Casserole can be made in the Crock Pot! I love doing that on Thanksgiving because it saves me precious space in the oven.

Cook it on low for 4 hours and don’t forget the Crock Pot liner.

Can this Easy Vegetable Casserole be made ahead of time?

Yes, it can be made ahead of time which is so nice during holiday planning. Make this Vegetable Casserole the day before and bake as directed.

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Do you need good side dish ideas? Try these recipes…

  • Sweet and Yukon Potato Au Gratin
  • Easy Homemade Mac and Cheese
  • Harvest Salad with Apples
  • Roasted Melting Potatoes
  • Winter Salad with Roasted Butternut Squash
  • One Rise Crescent Rolls

Frozen Vegetable Casserole Recipe - Practically Homemade (8)

Frozen Vegetable Casserole Recipe

An updated version of the classic Green Bean Casserole, this version is made with Frozen Vegetables. The addition of Parmesan Cheese and sour cream give it an extra special flavor.

Course: Side Dish

Cuisine: American

Author: June Albertson-Dick

Prep Time: 10 minutes minutes

Cook Time: 40 minutes minutes

Total Time: 50 minutes minutes

Servings: 8

4.87 from 15 votes

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Ingredients

  • 12 oz. bag frozen broccoli & cauliflower
  • 12 oz. bag frozen Country Trio {corn, carrots & green beans}
  • 2 cans cream of mushroom soup
  • 1/4 cup sour cream
  • 3/4 tsp black pepper
  • 3/4 tsp salt
  • 1/2 tsp garlic powder
  • 6 oz. container Crispy Fried Onions
  • 1/4 cup Parmesan Cheese

Instructions

  • Preheat oven to 350 degrees. In a large mixing bowl combine both bags of vegetables. Add cream of mushroom soup, sour cream, black pepper, salt, garlic powder and 4 oz. of crispy fried onions. Mix together, until everything is incorporated. Pour into a greased 9x13 rectangle baking dish {or large round baker}, top with Parmesan cheese and the remaining crispy fried onions. Bake for 40 minutes or until mixture is hot, bubbly and golden brown. Serve immediately.

Notes

*Use whatever kind of frozen vegetables you have on hand or that your family loves.

Tried this Recipe? Pin it for Later!Mention @PracticallyHomemade or tag #practicallyhomemade!

Frozen Vegetable Casserole Recipe - Practically Homemade (2024)

FAQs

Should you thaw frozen veggies before baking? ›

Do you need to thaw frozen vegetables before roasting? No need to the thaw the frozen vegetables. They can go from freezer to oven, but make sure to follow the directions and coat with oil and seasonings. Also, if any veggies are stuck together, make sure to separate before putting in the oven.

How to cook a homemade frozen casserole? ›

When you want to use your frozen casserole simply peel off the foil and then place it in the same size pan as you had originally frozen it. Place it in the refrigerator about one day before baking it. A casserole can be baked frozen but plan on double the time to bake it using an oven set to 350 degrees Fahrenheit.

What is the tastiest way to prepare frozen vegetables? ›

Roast your vegetables at a high enough temperature. I recommend roasting at 450 F in the oven of 400 F in the air fryer. I've found that frozen broccoli, green beans, cauliflower and brussel sprouts roast the best from frozen!

Can I cook a frozen casserole without thawing? ›

Yes. It is safe to reheat frozen leftovers without thawing, either in a saucepan or microwave (in the case of a soup or stew) or in the oven or microwave (for example, casseroles and combination meals).

What do you need to avoid when preparing frozen vegetables? ›

4 Common Mistakes to Avoid With Frozen Vegetables
  1. Defrosting Them Before Cooking.
  2. Steaming, Boiling, or Microwaving Them.
  3. Storing Them for Too Long.
  4. Not Branching Out.
Jan 2, 2023

How long to cook frozen vegetables in the oven? ›

Frozen Vegetable Cooking Times for 450 Degrees F
  1. Asparagus: 15-18 minutes.
  2. Broccoli: 18-20 minutes.
  3. Brussels Sprouts: 25-30 minutes.
  4. Butternut Squash: 18-20 minutes.
  5. Carrots: 22-25 minutes.
  6. Cauliflower: 25-30 minutes.
  7. Corn: 15-20 minutes.
  8. Mixed Frozen Vegetables: 16-18 minutes.
May 5, 2021

What seasoning to put on frozen vegetables? ›

Acidic ingredients like lemon or vinegar, fats like butter and olive oil, spicy condiments like chile flakes or hot sauce, savory ingredients like cheese, bacon and nuts and fresh and dried herbs are all your friends when it comes to frozen vegetables.

How do you cook frozen vegetables without getting soggy? ›

Roast Frozen Vegetables in Your Oven

Shull recommends roasting your veggies for 30 minutes at 400 degrees Fahrenheit on a parchment-paper-lined baking sheet and tossing every 10 minutes or so to help them cook evenly.

What's the appropriate technique for cooking frozen vegetables? ›

Cooking with too much water leads to mushy vegetables. That's why we recommend sautéing, roasting, or steaming frozen vegetables instead of boiling them. Here's how: Sauté – Heat a wide pan over medium high heat, add frozen vegetables and a little oil or butter, stir and cook (uncovered) for five to seven minutes.

Can you bake a frozen casserole in a glass dish? ›

The Best Containers For Freezing

You can certainly freeze it in whatever glass or ceramic casserole dish or metal pan you plan to bake it in, provided it is safe for both the freezer and the oven, or to be more specific, freezer-to-oven, which is the case for borosilicate glass such as Pyrex.

How long to bake frozen casserole at 350 degrees? ›

Preheat the oven to 350 degrees. Remove plastic lid covering and place either parchment paper or foil on top of frozen casserole. Place frozen casserole on the center rack of the oven. Bake for approximately 40-45 minutes (depending on casserole size).

Is it better to freeze casseroles cooked or uncooked? ›

If your casserole has raw protein, like chicken or shrimp, make sure to bake it and cool it completely before freezing. If it doesn't have protein or the protein is cooked, no pre-baking is necessary.

Is it better to cook vegetables frozen or thawed? ›

Most of the time, you don't need to thaw frozen vegetables before cooking with them—but it depends on what you're making. For soups, stews and pastas, you can toss still frozen vegetables right into the pot. These dishes can withstand some extra moisture, and the warmth will thaw out the veggies.

Can you cook frozen vegetables from frozen? ›

The first question most people ask about cooking with frozen vegetables is whether they need to be thawed before use, and in most cases the answer is a resounding NO! Adding frozen veggies to your pot, baking dish, or sauté pan while they're still frozen will generally yield the best result.

Are frozen vegetables OK if thawed? ›

Frozen Foods and Frozen Dinners: Do not refreeze frozen foods that have thawed; either cook them for consumption, discard or refreeze after cooking thoroughly. Vegetables: Do not refreeze thawed vegetables. Bacteria in these foods multiply rapidly. Spoilage may begin before odors develop.

What will happen if frozen vegetables are cooked immediately without thawing? ›

Cooking Without Thawing

If you don't have enough time to thaw food before cooking, it is safe to cook foods from a frozen state — but your cooking time will be approximately 50% longer than for foods that are fully thawed. Most frozen vegetables can be cooked without thawing.

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