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Brussels sprout casserole recipe.
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5 from 146 votes

Brussel Sprout Casserole Recipe

Easy Brussel sprout casserole recipe made with fresh Brussel sprouts lightly roasted and baked with a creamy parmesan cheese sauce.
Prep Time15 minutes
Cook Time25 minutes
Total Time40 minutes
Course: Side Dish
Cuisine: American
Servings: 4 servings
Author: Yumna Jawad

Ingredients

  • 1 pound brussel sprouts trimmed and halved
  • 1 tablespoon olive oil
  • ½ teaspoon salt
  • ¼ teaspoon black pepper
  • ¼ teaspoon garlic powder
  • 1 tablespoon unsalted butter
  • ½ small onion minced
  • 1 tablespoon all-purpose flour
  • 1 teaspoon mustard powder
  • 1 cup whole milk
  • ½ cup parmesan cheese divided

Instructions

  • Preheat the oven to 425°F.
  • Place brussel sprouts in a 8 x 11 casserole dish, drizzle with olive oil and season with salt, pepper, and garlic powder. Toss to coat evenly, and then bake until tender, about 10-15 minutes, depending on the size of your brussels, tossing halfway through.
  • In a small saucepan over medium heat, melt the butter. Add the onions and cook until translucent, about 5 minutes. Add the flour and mustard powder and stir until the flour dissolves, about 1-2 minutes. Slowly pour the milk and stir with a wooden spoon until the sauce thickens. Turn off the heat, add ¼ cup parmesan cheese and stir until well blended.
  • When the brussel sprouts are done roasting, pour the sauce over the brussel sprouts. Sprinkle the remaining parmesan cheese on top.
  • Return the brussel sprouts to the oven and cook until the cheese is melted and bubbly, 10- 15 more minutes. Serve immediately.

Video

Notes

  • My Top Tip: Remove the outer leaves of the sprouts before roasting them. These leaves can be dry and tough, so just peel them off before you cut the brussel sprouts in half.
  • Storage: Store any leftovers in an airtight container. They will last up to 3 days in the fridge.
  • Freezing: Let the casserole cool completely before wrapping the dish in foil and placing it in a freezer bag. It will keep well for up to 2 months and can be thawed in the fridge overnight before reheating. 
Substitutes: For best results, follow the recipe as is. However here are some common substitutes that would work well in this recipe.
  • Instead of regular milk, you can use any unsweetened plant-based milk.
  • Instead of gruyere cheese, you can use shredded cheddar cheese or another one you like.
  • To make this gluten-free, use an all-purpose gluten-free flour mix. You can also substitute with almond flour.

Nutrition

Serving: 0.25lb | Calories: 210kcal | Carbohydrates: 18g | Protein: 10g | Fat: 12g | Saturated Fat: 5g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Trans Fat: 0.1g | Cholesterol: 26mg | Sodium: 562mg | Potassium: 586mg | Fiber: 5g | Sugar: 6g | Vitamin A: 1151IU | Vitamin C: 97mg | Calcium: 240mg | Iron: 2mg

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