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broccoli cauliflower cheese casserole with spoon in casserole dish
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4.9 from 38 votes

Cheesy Broccoli Cauliflower Casserole

Looking for an easy side dish? This casserole is the perfect side dish for the weeknight! Plus, it's perfect for a holiday side dish too! 
Prep Time15 mins
Cook Time30 mins
Total Time45 mins
Course: Side Dish
Cuisine: American
Servings: 8
Calories: 332kcal
Author: Julie Evink


  • 10.75 oz condensed cream of mushroom soup 10.75 oz
  • 1 c. sour cream
  • 1 1/2 c sharp cheddar cheese shredded, divided
  • 6 oz french fried onions
  • 16 oz frozen broccoli florets thawed
  • 16 oz frozen cauliflower florets thawed


  • Preheat oven to 325 degrees F. Grease 2 quart baking dish and set aside.
  • In a saucepan combine soup, sour cream, 1 c. cheese and 1 1/4 c. fried onions. Stir over medium heat until blended. Add broccoli and cauliflower (thawed), stir until combined.
  • Transfer to prepared baking dish. Place in preheated oven and baked 25-30 minutes, uncovered. Top with remaining cheese and onions and place back in oven until cheese melts.


Expert Tips
  • When it comes to baking a casserole, glass or pyrex is your best choice. Both glass and pyrex take longer to heat up, but conduct heat well and get super hot. An oven-safe dish is a must. Another must? Dishwasher safe for easy clean-up!
  • If you would like to want to use fresh vegetables you can but you would need to steam or roast them first. This is the perfect time to take a shortcut and use frozen vegetables. This is a terrific pantry-staple side dish!
  • I recommend sharp cheddar cheese. It gives a tanginess to the recipe that makes it a real winner! Though you can certainly substitute with Monterey Jack or Provolone Cheese. If you do use a milder cheese a handful of parmesan will add the sharp saltiness of the cheddar. 
  • Grab a block of cheese and grate it yourself because it will melt better! Pre-Shredded cheese has additives that hinder it from melting.


Calories: 332kcal | Carbohydrates: 18g | Protein: 10g | Fat: 24g | Saturated Fat: 12g | Cholesterol: 39mg | Sodium: 638mg | Potassium: 459mg | Fiber: 2g | Sugar: 3g | Vitamin A: 750IU | Vitamin C: 78.2mg | Calcium: 226mg | Iron: 1.1mg