Cheesy Vegetable Casserole (with Crispy Fried Onions)
This Cheesy Vegetable Casserole (with Crispy Fried Onions) is a fantastic side dish for even the pickiest of eaters.
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What This Casserole Is
This creamy cheese sauce pairs perfectly with the broccoli, cauliflower and carrots. The best part is that you can make the sauce completely from scratch! I use my own mushroom soup recipe and it makes it so much better than store bought. On top of that, I make my own French fried onions and it makes it so much more special.
Why You’ll Love This Recipe
- One dish = complete side
- Uses simple ingredients
- Freezer-friendly
- Crowd favorite
- Perfect for holidays or weeknights
🛒 Ingredients
- Broccoli florets
- Cauliflower florets
- Carrots (sliced or shredded)
Sauce:
- Butter
- Garlic
- Flour
- Milk or cream
- Swiss cheese (shredded)
- Sour cream
Topping:
🔄 Ingredient Substitutions
- Frozen veggies instead of fresh
- Swap cheddar for mozzarella or Colby Jack
- Add chicken for a main dish
- Use gluten-free flour if needed
How to Make Cheesy Vegetable Casserole
Prep the veggies
- Steam or blanch until just tender
Combine
- Mix veggies + soup + cheese + sour cream
Bake
- Transfer to casserole dish
- Bake until bubbly
Add topping
- Add fried onions
- Bake until golden + crispy
🔥 Tips for the BEST Casserole
- Don’t overcook veggies (avoid mush)
- Shred your own cheese (melts better)
- Add onions at the END so they stay crispy
- Let it rest before serving
Storage + Reheating
- Fridge: 3–4 days
- Freezer: up to 2 months
- Reheat: oven > microwave for best texture
What to Serve With It
- Sunday Roast
- Ham (great for holidays 👀)
- Steak
- Thanksgiving or Christmas dinner
FAQs
Can I use frozen vegetables?
Yes, just thaw and drain well.
How do I keep it from being watery?
Don’t overcook veggies + use a thick cheese sauce.
Can I make it ahead of time?
Yes! Add onions right before baking.
Can I make it without cream soup?
Yes—this recipe uses a homemade cheese sauce.
Other Recipes to Try:
Cheesy Broccoli Cauliflower Carrot Casserole
Equipment
Ingredients
- 2 Cups Swiss Cheese
- 1¼ Cups Cream of Mushroom Soup Homemade or Store bought
- ½ Cup Sour Cream
- French Fried Onions
- 2 Cups Broccoli
- 2 Cups Cauliflower
- 2 Cups Carrots
Instructions
- Preheat oven to 350℉
- In a mixing bowl add veggies.
- Mix in Swiss cheese, mushroom soup and sour cream together.
- Pour into 9x13baking dish and top with French fried onions.
- Bake at 350℉ for 30 minutes.
