Broccoli Mushroom Casserole

This easy vegetable side dish combines chopped broccoli with mushrooms, onion, cheese and cream of mushroom soup to make a cheesy and delicious Broccoli Mushroom Casserole.

Cheesy mushrooms and broccoli showing in a serving of broccoli and mushroom casserole

This casserole tastes great served with Baked Pork Chops, Mashed Potatoes and Cinnamon Cream Cheese Bars for dessert!

Broccoli Casserole with Mushrooms

This casserole has been one of my mom’s favorites for years. She makes it for a warm vegetable side dish at a family dinner or for Thanksgiving, Christmas and Easter. Combining a few vegetables with cheese and a creamy soup is so satisfying and yummy!

This casserole is very smooth and creamy, which is exactly how our family likes it. If you want to add a little crunch and more texture add some crushed croutons to the top before baking. Our traditional Cheesy Broccoli Casserole adds Ritz crackers and butter and our Baked Vegetable Medley adds French Fried Onions. There are many options for a topping if that’s your desire.

An easy veggie side dish is often served along side a few other classics like Scalloped Corn Casserole, Sweet Potato Soufflé or a Cheesy Broccoli Cornbread at a holiday meal. People always appreciate having more options and this casserole is one that mushroom lovers crave.

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Casserole dish full next to plate with broccoli and mushroom casserole

The most simple way that we prepare broccoli is in the Air Fryer with Garlic & Parmesan. Sometimes we add Ranch Dressing to the Instant Pot. But sometimes you want to dress your broccoli up. Broccoli & Cauliflower Salad is great when you want a crunchy refrigerated dish and this casserole is great when you want a warm, smooth and creamy dish.

Broccoli Mushroom Casserole Recipe

  1. Butter a square 9″ casserole dish and preheat oven to 350°F.
  2. Melt butter in a skillet and sauté onion in that butter until lightly browned.
  3. Partially cook broccoli and pour into a mixing bowl. Add well drained mushrooms, cream of mushroom soup, sautéd onions and cheddar cheese. Stir well.
  4. Pour into casserole dish and bake for 45 minutes to an hour.
Scoop on warm cheesy broccoli and mushroom casserole on plate with fork

Tips for Making Broccoli Casserole with Mushrooms

  • Crushed croutons can be sprinkled on top before baking if desired
  • We find that using frozen broccoli and canned mushrooms which can both be stored for months, makes it easy to keep ingredients on hand.
  • Fresh ingredients can be used, but should be chopped into small pieces to maximize flavor – fresh mushrooms can be sautéed with onions
  • Choose a frozen broccoli that has more than just stems to increase the quality of the casserole
  • I’ve been known to stir in some extra cheese
  • Be sure to drain can mushrooms well to avoid a soupy casserole
  • Cream of mushroom soup can be substituted for cream of chicken soup
  • Small piece of chopped, cooked chicken could be added to the casserole before baking

How to Make Broccoli & Mushroom Casserole

Only six simple ingredients that are easy to store are needed to make this casserole.

Chopped broccoli, cream of mushroom soup, sliced mushroom, cheddar cheese, onion and butter - ingredients to make Broccoli Mushroom Casserole

Sauté onions in butter in a skillet.

While onions are sautéing par cook or partially cook chopped broccoli so that it is no longer cold, but not fully cooked. The broccoli will finish cooking while the casserole is baking.

Mushrooms sautéing in skillet and frozen broccoli in a microwave safe dish

In a large mixing bowl stir all of the ingredients together.

Ingredients needed to make cheesy broccoli mushroom casserole with cream of mushroom soup

Pour into a buttered 9 inch square casserole dish.

Casserole ingredients mixed together and poured into 9" baking dish

Bake uncovered at 350°F for 45 minutes to 1 hour.

Baked broccoli and mushroom casserole

Serve warm and enjoy!

Leftovers can be stored in an air tight container in the refrigerator for 2 to 4 days or can be frozen for up to 3 months.

Other Recipes with Broccoli

Serving spoon of broccoli casserole with mushrooms and cheese

Other Delicious Side Dish Recipes

Serving of baked broccoli mushroom casserole on white plate with a fork

Broccoli Mushroom Casserole

Servings 8 people
Jennifer @ Plowing Through Life
This easy vegetable side dish combines chopped broccoli with mushrooms, onion, cheese and creamy of mushroom soup to make a cheesy and delicious Broccoli Mushroom Casserole.
Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour

Ingredients
  

  • 24 ounces chopped frozen broccoli
  • 10.5 ounces cream of mushroom soup
  • 1 medium onion chopped
  • 2 tablespoons butter
  • 1 cup sharp cheddar cheese
  • 4 ounce can of mushrooms drained

Instructions
 

  • Saute mushrooms in butter. Lightly cook brocoli, should not be overcooked and mushy, but should not be cold either.
  • Mix all ingredients together and pour into a buttered casserole dish.
  • Bake at 350°F for 45 minutes to 1 hour.

Notes

  • We find that using frozen broccoli and canned mushrooms which can both be stored for months, makes it easy to keep ingredients on hand.
  • Fresh ingredients can be used, but should be chopped into small pieces to maximize flavor – fresh mushrooms can be sautéed with onions
  • Choose a frozen broccoli that has more than just stems to increase the quality of the casserole
  • I’ve been known to stir in some extra cheese
  • Crushed croutons can be sprinkled on top before baking if desired
  • Be sure to drain can mushrooms well to avoid a soupy casserole

Nutrition

Calories: 142kcalCarbohydrates: 10gProtein: 8gFat: 9gSaturated Fat: 5gCholesterol: 24mgSodium: 406mgPotassium: 395mgFiber: 3gSugar: 2gVitamin A: 759IUVitamin C: 77mgCalcium: 146mgIron: 1mg

Nutritional Disclaimer

“Plowing Through Life” is not a dietitian or nutrition professional. Any nutritional information shared is an estimate and can vary greatly depending on specific products are used. If calorie count and other nutritional values are important to you, we recommend running the ingredients through an online nutritional calculator of your choice.

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