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High Protein Breakfast Casserole: Sausage Frittata with Spinach and Mushrooms

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  • Author: Asma
  • Prep Time: 10 minutes
  • Cook Time: 20 minutes
  • Total Time: 30 minutes
  • Yield: 10 servings 1x
  • Category: Breakfast
  • Method: Baking
  • Cuisine: American
  • Diet: Gluten Free

Description

This easy, one-pan Sausage Frittata with Spinach and Mushrooms is a high-protein breakfast casserole perfect for busy mornings, brunches, or meal prep. Packed with eggs, sausage, veggies, and cheese, it’s keto, low-carb, and gluten-free!


Ingredients

Units Scale
  • Protein & Veggies:
    • 16 oz crumbled breakfast sausage (e.g., Jimmy Dean’s)
    • 8 oz mushrooms (baby Bella or crimini, sliced)
    • 5 oz fresh spinach
  • Egg Mixture:
    • 8 large eggs
    • 3/4 cup heavy cream
  • Cheese:
    • 1 cup sharp cheddar cheese (shredded)
  • Seasoning:
    • Salt and pepper to taste

Instructions

Cook the Filling

  1. Preheat Oven: Preheat to 375°F (190°C).
  2. Cook Sausage: Heat a 10- or 12-inch cast iron skillet over medium heat. Cook sausage until browned, crumbling as it cooks. Drain any grease and transfer the sausage to a bowl.
  3. Cook Veggies: In the same skillet, add mushrooms and season with salt and pepper. Cook for about 3 minutes until softened. Add spinach and cook until wilted. Return the sausage to the skillet.

Prepare the Frittata

  1. Mix Eggs and Cream: In a bowl, whisk together eggs and heavy cream until fluffy.
  2. Assemble: Pour the egg mixture over the sausage, spinach, and mushrooms in the skillet. Sprinkle shredded cheddar cheese on top, gently pressing some into the mixture.

Bake and Rest

  1. Bake: Place the skillet in the oven and bake for 15–20 minutes, or until the frittata is set and the center is no longer wobbly.
  2. Cool: Let the frittata rest for 15 minutes before slicing and serving.

Notes

  • Sausage Options: Use mild or hot breakfast sausage, or substitute with Italian sausage or plant-based sausage for a meatless option.
  • Veggie Variations: Swap spinach for kale, Swiss chard, broccoli, or asparagus.
  • Alternative Pans:
    • Baking Dish: Use a greased 9×13-inch pan; bake as directed.
    • Muffin Pan: Divide the mixture into a 12-cup muffin pan, filling each 2/3 full. Bake for 20 minutes.

Nutrition

  • Serving Size: Per Serving
  • Calories: 303 kcal
  • Sugar: 1 g
  • Fat: 26 g
  • Protein: 15 g