Slow Cooker Spinach and Mozzarella Frittata
Recipe found online, source information lost from the copy to my files.

Yields: 6 Servings

Ingredients

1/2 cup diced red onion
1 cup shredded mozzarella cheese, divided
3 eggs
3 egg whites
(total of 6 eggs)
2 tablespoons milk (your preference)
1/4 teaspoon black pepper
1/4 teaspoon red pepper flakes
1 (packed) cup chopped baby spinach, with stems removed
1 Roma tomato, diced
Salt to taste

Directions

Lightly spray the inside of the slow cooker with nonstick cooking spray.

In a large bowl, combine sautéed onion, 3/4 cup mozzarella cheese, and remaining ingredients; whisk to combine, and pour into slow cooker. Sprinkle remaining 1/4 cup cheese on top of egg mixture. Cover, and cook on LOW for 1–1 1/2 hours, or until eggs are set and a knife inserted in the center comes out clean.