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Spicy Sausage and Caramelized Onion Breakfast Casserole

Spicy Sausage and Caramelized Onion Breakfast Casserole

This Spicy Sausage and Caramelized Onion Breakfast Casserole is one of my favorite low carb/keto breakfasts. The sweetness of the caramelized onions are what really make this such an awesome breakfast casserole.

Course Breakfast
Cuisine American
Keyword keto, low carb, low carb breakfast casserole
Prep Time 20 minutes
Cook Time 40 minutes
Total Time 1 hour
Servings 9
Calories 444 kcal


  • 3 tablespoons butter
  • 1 large sweet onion, diced
  • 1 pound spicy breakfast sausage
  • 1 (8-ounce) package white mushrooms, sliced
  • 10 large eggs
  • 3/4 cup heavy cream
  • 1 1/2 cups shredded Colby Jack cheese
  • 1/2 teaspoon garlic powder
  • 1/2 teaspoon salt
  • 1/4 teaspoon pepper


  1. Melt butter in a large skillet over medium-low heat. Add onion and cook, stirring occasionally until golden, about 15 minutes. Let cool slightly.

  2. In a second large skillet cook and crumble sausage meat. When sausage is about halfway done, add mushrooms. Continue to cook until sausage is no longer pink and mushrooms are golden brown. Let cool slightly.

  3. In a large bowl, whisk together eggs and heavy cream. Stir in cheese, garlic powder, salt and pepper.

  4. Transfer sausage, mushrooms, and onions to a greased 7x11-inch pan. Pour egg mixture over the top.

  5. Bake for 40 minutes in a 350 degree oven.

Nutrition Facts
Spicy Sausage and Caramelized Onion Breakfast Casserole
Amount Per Serving
Calories 444 Calories from Fat 333
% Daily Value*
Fat 37g57%
Saturated Fat 17g106%
Cholesterol 328mg109%
Sodium 715mg31%
Potassium 298mg9%
Carbohydrates 4g1%
Sugar 2g2%
Protein 21g42%
Vitamin A 1005IU20%
Vitamin C 2.2mg3%
Calcium 212mg21%
Iron 1.9mg11%
* Percent Daily Values are based on a 2000 calorie diet.