Preheat your oven to 350°F (175°C) and lightly grease a standard muffin tin with a small amount of olive oil.
Place a skillet over medium heat and add the olive oil. Once hot, add the ground turkey sausage and cook until browned and crumbled, about 5-7 minutes.
Add the finely diced red bell pepper to the skillet and sauté for 2-3 minutes until slightly softened.
Stir in the baby spinach and cook just until wilted, then remove the skillet from the heat to cool slightly.
In a medium mixing bowl, whisk together the large eggs, egg whites, sea salt, black pepper, and garlic powder until well combined and slightly frothy.
Distribute the cooked sausage and vegetable mixture evenly among 6 muffin cups.
Pour the egg mixture over the sausage and vegetables in each cup, filling them about three-quarters of the way to the top.
Bake for 20-25 minutes, or until the eggs are set and the tops are lightly golden brown.
Allow the muffins to cool in the tin for 5 minutes before using a knife to gently loosen the edges and remove them.