A comforting, cheesy vegetable casserole with tender broccoli, soft cauliflower, and a rich cheddar cheese sauce topped with a golden, crunchy crust.
If you’re looking for an easy side dish that brings comfort and flavor to the dinner table, this Broccoli and Cauliflower Casserole is a wonderful choice. It combines two wholesome vegetables with a creamy cheese sauce and a delicious baked topping.
The broccoli and cauliflower become tender while holding their shape, and the cheddar sauce adds a rich, savory flavor to every bite. A sprinkle of breadcrumbs and Parmesan creates a golden topping that makes this casserole especially satisfying.
This recipe is perfect for family dinners, holiday gatherings, potlucks, or a cozy weeknight meal. Serve it alongside roasted chicken, baked fish, grilled meat, or enjoy it as part of a vegetarian dinner.
Why You’ll Love This Broccoli and Cauliflower Casserole
- Creamy and cheesy: A homemade cheddar sauce coats every vegetable floret.
- Easy to prepare: Simple ingredients and straightforward steps make this recipe approachable.
- Perfect for sharing: The casserole makes six generous servings.
- Customizable: Add bacon, chicken, extra cheese, or your favorite seasonings.
- Great for gatherings: It works beautifully as a holiday side dish or family dinner addition.
Recipe Details
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Total Time: 45 minutes
- Oven Temperature: 375°F (190°C)
- Servings: 6 portions
Ingredients
For the Casserole
- 3 cups broccoli florets, fresh or frozen
- 3 cups cauliflower florets, fresh or frozen
- 2 tablespoons butter
- 2 tablespoons all-purpose flour
- 1 cup milk
- ½ cup heavy cream
- 1½ cups shredded cheddar cheese, divided
- ½ teaspoon garlic powder
- ½ teaspoon onion powder
- ¼ teaspoon black pepper
- ½ teaspoon salt, or to taste
- ¼ teaspoon paprika, optional
- ½ cup breadcrumbs, optional
- 2 tablespoons grated Parmesan cheese, optional
Instructions
Step 1: Preheat the Oven
Preheat your oven to 375°F (190°C). Lightly grease a medium-sized baking dish with butter or cooking spray.
Preparing the dish ahead of time helps prevent the casserole from sticking and makes serving easier.
Step 2: Prepare the Broccoli and Cauliflower
Wash the broccoli and cauliflower thoroughly. Cut them into evenly sized, bite-sized florets so they cook at a similar rate.
Bring a large pot of water to a boil. Add the cauliflower and cook for about 3 minutes. Add the broccoli and cook for another 2–3 minutes, until both vegetables are slightly tender but still firm.
Drain the vegetables thoroughly and allow excess moisture to escape. This is an important step because water left on the vegetables can make the finished casserole runny.
If using frozen vegetables, thaw them completely and drain well before assembling the casserole.
Step 3: Make the Creamy Cheese Sauce
Melt the butter in a saucepan over medium heat.
Add the flour and whisk continuously for about 1 minute to create a smooth paste. This mixture helps thicken the sauce.
Gradually pour in the milk while whisking to prevent lumps. Add the heavy cream and continue cooking for 3–5 minutes, stirring frequently, until the sauce thickens.
Stir in the garlic powder, onion powder, salt, black pepper, and optional paprika.
Reduce the heat to low. Add 1 cup of shredded cheddar cheese and stir until the cheese melts into the sauce.
The sauce should be smooth, creamy, and thick enough to coat the vegetables.
Step 4: Combine the Vegetables and Cheese Sauce
Place the drained broccoli and cauliflower in a large mixing bowl or directly into the prepared baking dish.
Pour the creamy cheese sauce over the vegetables. Gently stir or toss until the florets are evenly coated.
Sprinkle the remaining ½ cup of cheddar cheese over the top.
For a crunchy topping, combine the breadcrumbs with the optional Parmesan cheese and distribute the mixture evenly over the casserole.
Step 5: Bake Until Golden
Place the casserole in the preheated oven and bake uncovered for 20–25 minutes.
The casserole is ready when the cheese sauce is bubbling and the top is lightly golden.
For an extra-crispy topping, broil for 1–2 minutes at the end of baking. Watch carefully, as breadcrumbs and cheese can brown quickly under the broiler.
Allow the casserole to rest for about 5 minutes before serving. This gives the sauce a chance to settle and makes the portions easier to serve.
Tips for the Best Broccoli and Cauliflower Casserole
Drain the Vegetables Thoroughly
Excess moisture is one of the main reasons vegetable casseroles become watery. After blanching, drain the vegetables well and allow them to steam-dry briefly before adding the sauce.
Avoid Overcooking the Vegetables
The broccoli and cauliflower should be slightly firm before baking. They will continue to soften in the oven, so cooking them until completely tender during the preparation stage may result in mushy vegetables.
Use Freshly Grated Cheese
Freshly grated cheddar generally melts more smoothly than many pre-shredded cheeses. Pre-shredded varieties may contain anti-caking ingredients that can affect the texture of the sauce.
Make the Sauce Thick Enough
The cheese sauce should be creamy rather than thin. Allow it to simmer gently until it thickens before adding the cheese and combining it with the vegetables.
Customize the Topping
Breadcrumbs create a crisp finish, while extra cheddar or Parmesan gives the casserole a richer, cheesier crust. Choose whichever topping you prefer.
Delicious Variations
Broccoli and Cauliflower Casserole with Bacon
Add about ½ cup of cooked, crumbled bacon before baking. The smoky, savory flavor pairs beautifully with the creamy cheese sauce.
Low-Carb Broccoli and Cauliflower Casserole
Skip the breadcrumbs and use a suitable low-carbohydrate thickener in place of the flour if desired. Keep in mind that the milk, cream, and cheese still contribute carbohydrates, so check ingredient labels if you are following a specific dietary plan.
Extra-Cheesy Casserole
Mix cheddar with mozzarella or Monterey Jack for a different flavor and texture. You can also sprinkle additional cheese over the top before baking.
Chicken Broccoli and Cauliflower Casserole
Add 1–2 cups of cooked, shredded chicken to turn this side dish into a more filling meal. Stir the chicken into the vegetables before adding the cheese sauce.
Gluten-Free Casserole
Use a suitable gluten-free flour blend to thicken the sauce and gluten-free breadcrumbs for the topping. Check all ingredient labels to ensure they meet your dietary needs.
What to Serve with Broccoli and Cauliflower Casserole
This versatile casserole pairs well with a variety of main dishes.
Try serving it with:
- Roasted chicken
- Grilled steak
- Baked salmon
- Pork chops
- A fresh garden salad
- Roasted potatoes
- Lentils or other vegetarian dishes
For a simple vegetarian meal, serve the casserole with roasted potatoes or lentils and a fresh green salad.
Make-Ahead Instructions
This casserole can be prepared ahead of time, making it especially useful for busy evenings and holiday meals.
Prepare the vegetables and cheese sauce, then assemble the casserole in the baking dish. Cover and refrigerate for up to 24 hours before baking.
When ready to cook, remove the cover and bake until the sauce is bubbling and the topping is golden. If the casserole is still cold from the refrigerator, it may need a little additional baking time.
For the best texture, add the breadcrumb topping shortly before baking.
Storage and Reheating
Refrigerator
Allow leftovers to cool and refrigerate them in an airtight container within 2 hours. Store for up to 3–4 days.
Freezer
Freeze the casserole in a suitable airtight container for up to 2 months for best quality. The creamy sauce may change texture slightly after thawing.
Reheating
Reheat individual portions in the microwave until steaming hot.
To reheat a larger portion, place it in an oven at 350°F (175°C) until heated through. Cover loosely with foil if the topping begins to brown too quickly.
For food safety, reheat leftovers to an internal temperature of 165°F (74°C).
Nutrition Information
Estimated nutrition per serving, assuming 6 servings and including the breadcrumbs but excluding optional Parmesan:
| Nutrient | Amount |
|---|---|
| Calories | 280 kcal |
| Protein | 12 g |
| Total Carbohydrates | 17 g |
| Dietary Fiber | 4 g |
| Total Fat | 19 g |
| Saturated Fat | 11 g |
| Sugar | 5 g |
| Sodium | 430 mg |
Nutrition values are estimates and may vary depending on the type of cheese, milk, cream, breadcrumbs, and serving size.
Frequently Asked Questions
Can I make Broccoli and Cauliflower Casserole ahead of time?
Yes. Assemble the casserole, cover it, and refrigerate for up to 24 hours before baking. Add extra baking time if the dish is cold when it goes into the oven.
Can I use frozen broccoli and cauliflower?
Yes. Frozen vegetables work well in this recipe. Thaw them completely and drain thoroughly before adding the cheese sauce to help prevent excess moisture.
How do I keep the casserole from becoming watery?
Avoid overcooking the vegetables, drain them thoroughly, and make sure the cheese sauce has thickened before combining everything.
Can I make this casserole without breadcrumbs?
Absolutely. Leave out the breadcrumbs and top the casserole with extra cheddar or Parmesan cheese instead.
What cheese works best?
Cheddar provides a classic flavor and melts well in the sauce. Mozzarella, Monterey Jack, or a combination of cheeses can also be used for a different texture and taste.
Final Thoughts
This Broccoli and Cauliflower Casserole is a delicious way to serve vegetables with a comforting, cheesy twist. Tender florets, creamy cheddar sauce, and a golden topping come together in a simple recipe that works for both everyday dinners and special occasions.
With a few easy variations, you can make it extra cheesy, add chicken or bacon, or prepare a gluten-free version. Serve it warm and enjoy a comforting casserole that brings plenty of flavor to the table.
