As I stood in my kitchen, the comforting aroma of baking vegetables filled the air, reminding me of family gatherings filled with laughter and warmth. Today, I’m thrilled to share my Creamy Cheesy Broccoli and Cauliflower Casserole—an irresistible blend of tender broccoli and cauliflower enveloped in a rich, savory cheddar sauce. This dish not only brings a cozy sense of nostalgia to the table but also promises quick prep and beginner-friendly steps to delight both seasoned chefs and newcomers alike. Perfect for those busy weeknights or festive occasions, you’ll find this casserole a satisfying crowd-pleaser that turns simple ingredients into a family favorite. Are you ready to create a dish that will warm hearts and bellies? Let’s dive into the recipe!

Why is this casserole a must-try?
Creamy Comfort: Indulge in a rich, cheesy sauce that hugs each floret, creating a deliciously satisfying dish that everyone will love.
Beginner-Friendly: Easily follow simple steps to whip up this casserole in under an hour, perfect for busy weeknights or festive gatherings.
Versatile Enjoyment: Customize this recipe with your favorite add-ins, such as cooked bacon or even a sprinkle of spinach, making it a great way to sneak in extra veggies.
Perfect for Sharing: Gather your family around as this dish serves plenty, turning any meal into a memorable occasion.
Classic Appeal: Experience the nostalgia of comforting flavors reminiscent of family meals, proving that homemade food always wins over fast food. Don’t forget to check out other delicious options like One Pot Broccoli for more creamy goodness!
Broccoli and Cauliflower Casserole Ingredients
For the Vegetables
• Broccoli Florets – Provides structure and crunch; tender yet sturdy, holding up well in the baking process.
• Cauliflower Florets – Offers a mellow, nutty flavor that complements broccoli; can use frozen cauliflower, thawed and drained thoroughly.
For the Sauce
• Sharp Cheddar Cheese (2 cups) – Adds a tangy punch and creamy melt; half for the sauce, half for the topping.
• Sour Cream (1 cup) – Creates a smooth sauce with a gentle tang; Greek yogurt can substitute for a healthier option.
• Mayonnaise (1/2 cup) – Enhances creaminess; can reduce or replace with low-fat variety to lessen calories.
• Dijon Mustard (1 tablespoon) – Enhances flavors with a mild kick.
• Garlic Powder (1/2 teaspoon) – Adds depth of flavor without chopping.
• Onion Powder (1/4 teaspoon) – Rounds out the sauce’s flavor profile.
• Salt and Pepper – Essential seasonings for taste balance.
For the Topping
• Breadcrumbs (1 cup) – Provides a crunchy topping when toasted; they soak up butter for added flavor.
• Melted Butter (2 tablespoons) – Ensures the breadcrumbs toast to a golden crisp.
• Parmesan Cheese (1/4 cup) – Adds nuttiness and assists in browning the topping; essential for getting a crispy texture.
This delightful Broccoli and Cauliflower Casserole is sure to become a favorite in your home!
Step‑by‑Step Instructions for Broccoli and Cauliflower Casserole
Step 1: Preheat the Oven
Begin by preheating the oven to 350°F (175°C). This temperature ensures a perfectly baked Broccoli and Cauliflower Casserole with a golden, bubbling topping. Prepare a 9×13-inch casserole dish by greasing it lightly with cooking spray or butter, so the casserole easily comes out after baking.
Step 2: Prepare the Vegetables
In a large pot, bring salted water to a rolling boil. Add the broccoli and cauliflower florets, cooking them for about 5 minutes until they are tender-crisp. Keep an eye on them, as you want vibrant green veggies that still have a bit of bite. Once cooked, drain the vegetables and transfer them to a bowl of ice water to halt the cooking process.
Step 3: Drain and Cool the Vegetables
After cooling the broccoli and cauliflower in the ice water for a few minutes, drain them again. This step ensures the veggies are not watery, making for a better texture in your casserole. Set them aside while you prepare the creamy cheese sauce, allowing excess moisture to escape.
Step 4: Make the Cheese Sauce
In a mixing bowl, combine the sour cream, mayonnaise, Dijon mustard, garlic powder, onion powder, and half of the sharp cheddar cheese. Stir these ingredients together until the mixture is smooth and well-blended, creating a deliciously creamy sauce that will generously coat the vegetables in the Broccoli and Cauliflower Casserole.
Step 5: Mix in the Vegetables
Fold the cooled broccoli and cauliflower into the cheese sauce until the florets are fully coated. Be gentle to maintain the integrity of the vegetables while ensuring every piece is enveloped in that rich and creamy goodness. This will create a flavorful base for your casserole that brings an engaging taste and vibrant colors to the dish.
Step 6: Assemble the Casserole
Spread the vegetable and cheese mixture evenly in your greased casserole dish. Make sure to fill all corners and create an even layer. This will help with consistent cooking, ensuring that every bite of your Broccoli and Cauliflower Casserole is equally delightful and rich in flavor.
Step 7: Prepare the Topping
In a separate bowl, combine the breadcrumbs, melted butter, remaining cheddar cheese, and Parmesan cheese. Stir until the breadcrumbs are fully coated with butter and the cheeses are evenly distributed. This mixture will create a deliciously crispy topping that contrasts beautifully with the creamy filling.
Step 8: Top the Casserole
Sprinkle the breadcrumb mixture evenly over the top of the casserole, ensuring that it covers the entire surface. This layer adds a satisfying crunch that will provide delightful texture and flavor. The combination of cheeses and toasted breadcrumbs elevates the dish, making it so appealing.
Step 9: Bake the Casserole
Place the casserole in the preheated oven and bake for 25 to 30 minutes. Watch for the topping to turn golden brown and the edges to begin bubbling. This visual cue indicates that your Broccoli and Cauliflower Casserole is ready to be taken out, providing a comforting, warm aroma throughout your kitchen.
Step 10: Let it Rest
Once finished baking, remove the casserole from the oven and let it rest for about 5 minutes. This crucial step allows the sauce to set, making it easier to serve and ensuring that each portion holds together beautifully. Your Broccoli and Cauliflower Casserole is now ready to be enjoyed!

Expert Tips for Broccoli and Cauliflower Casserole
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Don’t Overcook: Avoid boiling your vegetables for too long; tender-crisp is the key to maintaining their vibrant color and texture in the casserole.
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Let It Rest: Allow the casserole to sit for 5 minutes after baking. This helps the sauce set up and ensures cleaner slices when serving.
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Customize Freely: Feel free to add cooked bacon, ham, or even different veggies like carrots for a boost of flavor and nutrition, keeping it versatile.
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Breadcrumb Bliss: Use fresh breadcrumbs for a better texture. If using store-bought, make sure they’re not overly seasoned to maintain balance in flavors.
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Watch the Cheese: Prevent the top from burning by keeping an eye on it towards the end of the baking time. Achieving that golden crust is essential for the best Broccoli and Cauliflower Casserole experience!
Make Ahead Options
These Creamy Cheesy Broccoli and Cauliflower Casserole is perfect for busy home cooks! You can prep the entire casserole up to 24 hours in advance by assembling it, covering it tightly with plastic wrap, and refrigerating. To maintain its quality, be sure to let the casserole sit at room temperature for about 30 minutes before baking. Alternatively, you can prepare the vegetables and cheese sauce separately, refrigerating them for up to 3 days. When it’s time to serve, simply combine everything in your greased casserole dish, add the breadcrumb topping, and bake until golden and bubbling. Convenience and deliciousness await!
What to Serve with Creamy Cheesy Broccoli and Cauliflower Casserole
As you prepare to delight your loved ones with this comforting casserole, consider these pairing ideas to create a wholesome and satisfying meal.
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Garlic Bread: The warm, buttery crunch of garlic bread is a perfect companion to the creamy casserole, perfect for scooping up extra sauce.
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Simple Green Salad: A crisp salad dressed in a light vinaigrette will add a refreshing contrast to the rich flavors, enhancing your dining experience.
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Roasted Chicken: Serve alongside juicy, herb-seasoned roasted chicken to balance the cheesy goodness, creating a hearty dinner everyone will enjoy.
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Steamed Asparagus: Bright green asparagus brings freshness and a delightful crunch, making the casserole even more colorful and inviting.
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Creamy Mashed Potatoes: Enhance comfort with velvety mashed potatoes; their texture harmonizes beautifully with the casserole’s creaminess.
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Apple Crisp: For dessert, indulge with a warm apple crisp; the sweetness and spiced flavors provide the perfect sweet finish to your meal.
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Sparkling Lemonade: A glass of bubbly lemon juice adds a refreshing zing that cleanses the palate and livens up your dinner table.
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Herb-Infused Quinoa: This nutritious side will complement the casserole perfectly, giving you a wholesome and nutritious finish to your meal.
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Roasted Root Vegetables: Sweet, caramelized roots provide earthy flavors that contrast delightful with the cheesy, creamy dish, making it a feast for the senses.
Broccoli and Cauliflower Casserole Variations
Feel free to put your own spin on this comforting dish with these delightful variations!
- Healthier Swap: Substitute Greek yogurt for mayonnaise for a lighter, tangy option. This not only boosts nutrition but maintains creaminess effortlessly.
- Cheese Choice: Try using mild cheddar instead of sharp cheddar if you prefer a milder flavor profile. It melts beautifully while keeping that comforting essence.
- Loaded Veggie: Incorporate cooked carrots or spinach for an added nutrition boost, making your casserole a colorful and wholesome delight.
- Vegan-Friendly: Swap the cheeses with plant-based cheese alternatives and use cashew cream instead of sour cream for a delicious vegan option. You might not even miss the dairy!
- Nutty Flavor: Add a sprinkle of toasted nuts, such as almonds or pecans, to the top for exceptional crunch and a nutty flavor that complements the cheese beautifully.
- Spicy Kick: If you enjoy heat, add a pinch of red pepper flakes or diced jalapeños to the cheese mixture for a spicy twist that warms the heart.
- Smoky Depth: Incorporate cooked bacon or smoked sausage pieces for a savory kick that enhances the overall flavor of your casserole. Your family will love the added depth!
- Creamy Variation: For a creamier texture, consider stirring in a bit of cream cheese or a drizzle of heavy cream into the cheese sauce before mixing in the vegetables.
As you adapt this recipe, you may want to check out other delicious options like Chicken Sausage Broccoli for more comforting meal ideas that fit every taste!
How to Store and Freeze Broccoli and Cauliflower Casserole
Fridge: Store leftover casserole in an airtight container for up to 3-4 days. Make sure to cool completely before covering to avoid moisture buildup.
Freezer: For longer storage, freeze the casserole in a freezer-safe container for up to 2-3 months. Consider portioning it into individual servings for easy reheating.
Reheating: Thaw overnight in the fridge before reheating. Warm in the oven at 350°F (175°C) for about 20-25 minutes until heated through, maintaining that comforting, cheesy goodness.
Wrapping: If the casserole hasn’t been fully baked, cover it tightly with foil to prevent freezer burn. For baked leftovers, wrap tightly with plastic wrap before freezing.

Broccoli and Cauliflower Casserole Recipe FAQs
How do I know if my broccoli and cauliflower are fresh?
Absolutely! Look for bright green broccoli florets without dark spots, while cauliflower should be creamy white and firm. The stems should feel crisp, and avoid any florets that show signs of wilting or browning.
How should I store leftover Broccoli and Cauliflower Casserole?
For the fridge, simply place your leftovers in an airtight container and enjoy them within 3-4 days. Be sure to cool it completely before sealing to prevent moisture buildup.
Can I freeze this casserole, and how do I do it?
Yes! You can freeze your casserole for up to 2-3 months. Ensure it’s well-wrapped – if it hasn’t been baked, just cover it tightly with foil. For baked leftovers, wrap portions with plastic wrap for easy reheating.
What if my casserole topping isn’t crispy enough after baking?
Very! If you find the topping isn’t golden and crunchy, pop it under the broiler for a couple of minutes at the end of baking. Just keep a close eye on it to avoid burning!
Are there any dietary considerations with this recipe?
Certainly! If you’re serving guests with dietary restrictions, consider swapping in Greek yogurt for sour cream, or use low-fat mayonnaise. And remember to check for cheese allergies, as both cheddar and Parmesan contain dairy. Enjoy customizing this dish to fit everyone’s needs!

Cheesy Broccoli and Cauliflower Casserole Your New Comfort Food
Ingredients
Equipment
Method
- Preheat the oven to 350°F (175°C) and grease a 9x13-inch casserole dish.
- Bring salted water to a rolling boil in a large pot. Add broccoli and cauliflower and cook for about 5 minutes until tender-crisp.
- Drain the cooked vegetables and transfer them to a bowl of ice water to halt cooking.
- After cooling, drain the vegetables again and set aside.
- In a mixing bowl, combine sour cream, mayonnaise, Dijon mustard, garlic powder, onion powder, and half of the sharp cheddar cheese. Mix until smooth.
- Fold the cooled broccoli and cauliflower into the cheese sauce until fully coated.
- Spread the vegetable and cheese mixture evenly in the greased casserole dish.
- Combine breadcrumbs, melted butter, remaining cheddar cheese, and Parmesan cheese in a separate bowl.
- Sprinkle the breadcrumb mixture evenly over the casserole.
- Bake in the preheated oven for 25 to 30 minutes until the topping is golden brown.
- Let the casserole rest for about 5 minutes before serving.

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