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Super creamy Asparagus Casserole with a french-fried onion topping.
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4.45 from 9 votes

Asparagus Casserole

Asparagus Casserole, made with fresh asparagus, is creamy and rich with a crunchy fried onion topping.
Course Side Dish
Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings 8 servings
Calories 368kcal
Author Christin Mahrlig

Ingredients

  • 4 tablespoons (1/2 stick) butter
  • 2 1/2 pounds asparagus, trimmed and cut into 1-inch pieces
  • 1 (8-ounce) package white mushrooms, sliced
  • 1/2 medium sweet onion, chopped
  • 1/4 cup all-purpose flour
  • 1 1/4 cup milk
  • 1/2 cup mayonnaise
  • 1/2 cup sour cream
  • 1/2 cup shredded cheddar cheese
  • 1/2 cup shredded swiss cheese
  • 1/2 teaspoon salt
  • 1/2 teaspoon lemon pepper
  • 1/4 teaspoon paprika
  • 1 (6-ounce) can french-fried onions.

Instructions

  • Grease a casserole dish and preheat oven to 350 degrees.
  • Melt butter in a large pan over medium heat. Add asparagus, mushrooms, and onions and cook, stirring occasionally, for about 6 minutes.
  • Sprinkle flour over vegetables and cook, stirring continuously, for 1 to 2 minutes.
  • Gradually stir in milk. Cook until thickened.
  • Reduce heat to low and mix in mayonnaise, sour cream, both cheeses, salt, lemon pepper, and paprika. Remove from heat.
  • Crush about 1/3 of the can of french-fried onions and mix them into the asparagus mixture.
  • Transfer mixture to prepared casserole dish.
  • Sprinkle remaining french-fried onions on top.
  • Place in oven and bake for 30 minutes.

Nutrition

Calories: 368kcal