Preheat your oven to 375 F.
Melt some cooking fat in a skillet placed over medium heat.
1 tbsp. cooking fat
Sauté the onion until soft, about 4 minutes, then add the mushrooms and tomatoes and cook for about 2 minutes.
1 cup mushrooms, 1 onion, 1 tomato
Add the spinach and cook until wilted, about 1 or 2 minutes.
3 cups baby spinach
Season to taste with salt, pepper, and garlic powder.
½ tsp. garlic powder, Sea salt and freshly ground black pepper, 4 bell peppers
Divide the vegetable mixture equally among the bell pepper halves
Top off each bell pepper half with some of the beaten eggs, and add the meat of your choice if using.
8 eggs, Bacon
Place the stuffed peppers in the oven on a baking sheet, and bake for 40 minutes.