Broccoli Cauliflower Casserole

Looking for an easy side dish? This cheesy Broccoli Cauliflower Casserole is the perfect side dish for the weeknight! Even your kids will love this casserole topped with cheese. Plus, it’s perfect for a holiday side dish too!

Warm and cheesy broccoli cauliflower casserole is a MEGA comfort food side dish. This flavorful and simple casserole pairs well with pretty much anything. Honestly, it’s so yummy that I would eat it all on its own. Just give me a spoon or a fork, I’m ready to eat the whole pan by myself!

What is it about casseroles that just make them so comforting? I mean, my cheeseburger casserole is one of our go-to cozy meals, cheesy ham and noodles casserole makes me drool just thinking about it, and broccoli cauliflower casserole is absolute perfection. If there’s a food out there that isn’t in casserole form, just give me time and I’ll make one!

Why You’ll Love this Broccoli Cauliflower Casserole

• It only takes 45 minutes to make this recipe from start to finish! But the prep time is only 15 minutes, making it super easy to throw together and pop in the oven.
• This is a wonderful dish for potlucks and parties. Impress the crowd with a deliciously cheesy creation!

Ingredients for Broccoli Cauliflower Casserole Recipe

• Frozen vegetables – Use both frozen broccoli florets and frozen cauliflower florets in this recipe. You can use fresh broccoli and fresh cauliflower if you prefer, but frozen is really easy to use in this recipe.
• Cream of mushroom soup – If you don’t like cream of mushroom soup, you can use cream of chicken instead.
• Sour cream – Make your casserole extra creamy and have a little sour bite with some sour cream. Even if you don’t like sour cream, give it a try in this recipe! It really does make all the difference.
• Sharp cheddar cheese – Mild cheddar cheese also works, but the bite of sharp cheddar is super tasty! You could also opt for a more “fancy” cheese like gruyere or gouda.
• French fried onions – French fried onions are a staple in green bean casserole, and they are for this delicious casserole too!

How to Make Broccolli Cauliflower Casserole

• Prep – Preheat the oven to 325 degrees F and then grease a baking dish and set it aside.
• Mix – In a large saucepan or large pot combine the canned soup, sour cream, shredded cheese and fried onions. Stir over medium heat until thoroughly combined and smooth, making a creamy cheese sauce. Then add the broccoli and cauliflower and continue stirring until combined. If needed, add some salt and black pepper.
• Bake – Pour the mixture to the previously prepared baking dish. Place in preheated oven and bake 25-30 minutes, uncovered to ensure the veggies are cooked to a tender texture. Top with remaining cheese and onions and place back in oven until cheese melts.

How to Store Broccoli Cauliflower Casserole

FRIDGE: Transfer leftovers to an airtight container and store in the refrigerator for up to3 days. You can also cover your broccoli and cauliflower casserole tightly in plastic wrap and store that way.

FREEZER: Leftover casserole can be frozen in an airtight container for up to 3 months. Keep in mind that the texture may change once it is thawed and reheated.

What to Serve with Broccoli and Cauliflower Casserole

This casserole is one of my favorite sides to serve with hearty protein dishes like garlic butter steak bites, baked chicken thighs and parmesan crusted tilapia. Air fryer whole chicken and crock pot turkey breast would pair well with this too.

Pork schnitzel and slow cooker chicken thighs are great main dishes to serve with this broccoli cauliflower casserole recipe too.

Can you make broccoli cauliflower casserole ahead of time?

Absolutely! Make it all the way up to the baking stage, but skip sprinkling the extra cheese and topping of fried onions. Then wrap the casserole tightly in plastic wrap and store in the fridge for 24-48 hours. When you are ready to bake your cauliflower broccoli casserole, add the toppings and bake!

Can I use a breadcrumb topping on this casserole?

If you want a different topping, a parmesan cheese breadcrumb topping would be super tasty. Just mix up some parmesan cheese, bread crumbs and melted butter and sprinkle it over the casserole. You can also add seasonings like garlic powder and onion powder.

Panko breadcrumbs, crushed ritz crackers, and gluten-free breadcrumbs will all work.

Is it better to use fresh or frozen broccoli in a casserole?

A large head of cauliflower or broccoli can be chopped up and used in this simple recipe, but you’ll need to steam or roast them first. I find it much easier to use frozen veggies. Ultimately, both fresh and frozen work great so you can use whichever you prefer! If you use fresh, just keep in mind that you may need to adjust the bake time.

See that cheesy goodness? I don’t know what you’ll love more: the cheesiness of this casserole or the crunchy onions when all of this bakes up to golden, bubbly deliciousness! Mmmm!!!! If you love this recipe, then try cheesy chicken broccoli rice casserole too.

More Casserole Recipes You’ll Love

• Got leftover ham? Make this easy Ham and Green Bean Casserole for dinner!
• Hosting the holidays? You can’t forget this easy Sweet Potato Casserole.
• Always a favorite at holidays is this easy Shredded Potato Casserole using frozen hash browns.
• A delicious twist on corn as a dish is Corn Pudding Casserole.