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baked cauliflower au gratin

Cauliflower Au Gratin

Creamy, flavorful Cauliflower Au Gratin uses only a few simple ingredients and is an easy side dish perfect for Thanksgiving or any other day!
Course Side Dish
Cuisine American
Keyword cauliflower au gratin
Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings 6 servings
Calories 279kcal
Author Lauren's Latest


  • 1 head cauliflower cut into bite size pieces
  • 1 small onion diced
  • 3 tablespoons butter
  • 4 tablespoons all purpose flour
  • 1 1/2 cups whole milk
  • 1/2 cup heavy cream
  • salt & pepper to taste
  • 1/4 teaspoon ground nutmeg
  • 1 cup cheddar cheese grated


  • Preheat oven to 400 degrees. Chop cauliflower into bite size pieces.
    cauliflower florets on cutting board
  • Steam cauliflower until fork tender. Drain really well. Place into buttered baking dish and set aside.
    steamed cauliflower in baking dish
  • While cauliflower is cooking, heat butter over medium heat in deep cast iron skillet. Saute onions until tender and brown, 5-7 minutes.
    onions cooking in butter in skillet
  • Whisk in flour to make a roux and cook for 2 minutes.
    flour, onion and butter cooking in pan
  • Add in milk, salt, pepper and nutmeg. Whisk until simmering and sauce has thickened.
    whisking white sauce in pan
  • Remove from heat and add in heavy cream.
    pouring heavy cream into white sauce
  • Pour sauce over steamed cauliflower.
    pouring white sauce over cauliflower
  • Top with cheese and bake 15 minutes. Serve hot.
    grated cheddar cheese on cauliflower au gratin


Calories: 279kcal | Carbohydrates: 13g | Protein: 10g | Fat: 22g | Saturated Fat: 13g | Cholesterol: 68mg | Sodium: 230mg | Potassium: 417mg | Fiber: 2g | Sugar: 6g | Vitamin A: 754IU | Vitamin C: 47mg | Calcium: 243mg | Iron: 1mg