Keto Sausage Breakfast Casserole

The Keto Sausage Breakfast Casserole is a hearty and satisfying dish prepared by baking a mixture of sausage, eggs, cheese, and optional low-carb vegetables for a classic, comforting flavor without the carb crash. Savory sausage provides bold flavor and fat, eggs create a soft, sliceable custard-like base, and a generous layer of melted cheese adds creamy richness on top. With each slice packed with protein and keto-friendly fats, this make-ahead casserole is perfect for breakfast, brunch, dinner, or a grab-and-go snack for anyone following a keto lifestyle.

Course Breakfast, Brunch, Dinner, Snack

Cuisine American

Keyword gluten free, keto breakfast casserole, low carb breakfast, make ahead keto meal, sausage egg and cheese bake

Prep Time 15

Cook Time 35

Total Time 50

Servings slices

Calories 420kcal

Equipment

9x13-inch Baking Dish
large skillet
Mixing bowl
Whisk
measuring cups
measuring spoons

Ingredients

For the sausage layer

1 pound ground pork breakfast sausage choose sugar free
1/4 cup yellow onion, finely diced about 1/4 small onion; use sparingly for lower carbs
1 tablespoon butter for greasing the baking dish

Optional low carb vegetables

1 cup fresh baby spinach, chopped sautéed to remove moisture
1/2 cup red bell pepper, finely diced about 1/2 small pepper
1/2 cup white mushrooms, finely chopped about 4 small mushrooms

For the egg mixture

10 large eggs at room temperature if possible
1 cup heavy whipping cream do not substitute with milk
1/4 cup unsweetened almond milk or additional heavy cream for extra richness
1 teaspoon sea salt
1/2 teaspoon black pepper freshly ground if possible
1/2 teaspoon garlic powder
1/2 teaspoon onion powder

For the cheese topping

1 1/2 cups shredded sharp cheddar cheese divided
1/2 cup shredded mozzarella cheese for extra meltiness
2 tablespoons grated Parmesan cheese for a golden top

Instructions

Preheat the oven to 350°F and generously grease a 9x13 inch baking dish with the butter.
Heat a large skillet over medium heat and add the ground pork breakfast sausage and diced onion, breaking the sausage into small crumbles as it cooks.
Cook the sausage and onion until the sausage is deeply browned and cooked through and the onion is softened, then drain off most of the excess grease while leaving a thin coating for flavor.
If using the optional vegetables, add the chopped spinach, bell pepper, and mushrooms to the same skillet and sauté over medium heat until the vegetables are softened and most of their moisture has evaporated, then remove from the heat.
Spread the cooked sausage mixture evenly over the bottom of the prepared baking dish and scatter the sautéed vegetables evenly over the sausage layer.
In a large mixing bowl whisk the eggs just until the yolks and whites are combined without whipping in too much air.
Add the heavy whipping cream, unsweetened almond milk, sea salt, black pepper, garlic powder, and onion powder to the eggs and whisk again until the mixture is smooth and well combined.
Sprinkle 1 cup of the shredded sharp cheddar cheese over the sausage and vegetable layer in the baking dish.
Slowly pour the egg mixture evenly over the sausage and cheese, gently tilting the pan if needed so the liquid reaches all corners without disturbing the layers too much.
In a small bowl toss together the remaining 1/2 cup shredded cheddar, the shredded mozzarella, and the grated Parmesan and then sprinkle this cheese mixture evenly over the top of the casserole.
Bake the casserole in the preheated oven for 30 to 35 minutes or until the center is just set, the edges are lightly puffed, and the top is golden and bubbling.
Remove the casserole from the oven and let it rest for at least 10 minutes to allow the custardy egg base to set before slicing into 8 even pieces.
Serve warm with optional toppings such as sliced avocado, a dollop of sour cream, or a dash of hot sauce, and store any leftovers in airtight containers in the refrigerator for up to 4 days.

Notes

For the best keto results choose a sugar free breakfast sausage and always check labels for hidden carbs or starches. You can customize the flavor by using spicy sausage, pepper jack cheese, or your favorite low carb vegetables as long as they are sautéed first to remove moisture and prevent a watery casserole. To meal prep, bake the casserole fully, cool it, and slice it into individual portions that can be refrigerated or frozen and reheated gently in the oven or microwave. Each slice is filling on its own but also pairs well with sliced avocado, a simple green salad, or a side of bacon for an ultra satisfying keto breakfast or breakfast for dinner.

Nutrition