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.

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.

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.

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.

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.

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

Pour into a buttered 9 inch square casserole dish.

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

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

• Loaded Broccoli Noodle Soup
• Sausage Link, Broccoli & Rice Crock Pot Casserole
• Crock Pot Broccoli & Turkey with Cheese Sauce

Other Delicious Side Dish Recipes

• Jiffy Corn Pudding because meat and veggies taste better with a side of carbs!
• Bacon-Onion Green Beans are another classic side dish for the holidays that is easy enough to make for regular family meals too.
• Carrot Salad with Celery & Mangos is a cool and crunchy way to eat more veggies that’s sweet and tangy at the same time.
• Air Fryer Roasted Cauliflower is another favorite way to make cauliflower because it’s so simple and delicious!
• Sweet Corn Spoon Bread takes cornbread to a whole new level with a thick layer of Swiss cheese on top.