Pan fry your sausage then chop into bits. Put aside for later.
Crack the eggs in a bowl and beat together with the spinach, tomato, bell pepper, onion, and cheese. Flavor with salt and black pepper. Whisk until incorporated.
Coat a muffin cup with cooking spray. Add the egg mixture in. Garnish with chopped sausage on the surface.
Bake for around 15 minutes before removing from the oven.