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Keto Breakfast Casserole

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This hearty, low-carb breakfast casserole is packed with sausage, eggs, spinach, and cheddar—perfect for meal prep, weekend brunch, or a protein-rich start to your day.

  • Author: Emma
  • Prep Time: 20 minutes
  • Cook Time: 25 minutes
  • Total Time: 45 minutes
  • Yield: 6 Servings (9 squares total; double up squares if serving larger portions)
  • Category: Breakfast
  • Method: Baking, Skillet
  • Cuisine: American
  • Diet: Gluten Free

Ingredients

Egg Mixture

8 large eggs

1/4 cup heavy cream (or full-fat Greek yogurt or softened cream cheese)

1/2 teaspoon Diamond Crystal kosher salt

1/4 teaspoon black pepper

1/2 teaspoon garlic powder

1/4 teaspoon red pepper flakes

Cheese

1 cup shredded cheddar cheese, divided (4 oz total; 1/2 cup mixed in, 1/2 cup on top)

Meat & Veggies

1 pound pork breakfast sausage

2 cups baby spinach leaves (2 oz)

Instructions

Preheat oven to 400°F and lightly grease a 9-inch square baking dish.

In a large bowl, whisk together eggs, heavy cream, salt, pepper, garlic powder, and red pepper flakes. Stir in 1/2 cup of the shredded cheddar. Set aside.

In a large 12-inch nonstick skillet over medium-high heat, cook the sausage for 5–7 minutes, breaking it into small pieces.

Turn off the heat and stir in spinach, letting it wilt in the skillet’s residual heat.

Spread the sausage-spinach mixture evenly in the prepared baking dish.

Pour the egg mixture over the top, then gently stir in the pan to distribute ingredients if needed. Top with the remaining 1/2 cup of cheese.

Bake for 25 minutes or until the eggs are set and cheese is melted.

Let rest for 10 minutes before slicing into 9 squares and serving.

Notes

Serving Size: One serving = 1 square (1/9 of the dish).

You can swap in different cheeses like Gruyère or Monterey Jack.

Substitute full-fat Greek yogurt or softened cream cheese for heavy cream, if desired.

Any type of sausage works, though breakfast sausage provides classic flavor.