Preheat your oven to 350°F (175°C) and lightly grease six wells of a standard muffin tin with the olive oil.
In a small non-stick skillet over medium heat, cook the ground turkey until browned and fully cooked through, then set aside to cool.
Finely chop the fresh spinach and the red bell pepper into small, uniform pieces.
In a medium mixing bowl, whisk together the whole eggs, liquid egg whites, sea salt, black pepper, and garlic powder until the mixture is well combined and slightly frothy.
Distribute the cooked ground turkey, chopped spinach, diced peppers, and shredded cheddar cheese evenly among the six prepared muffin cups.
Pour the egg mixture over the fillings in each cup, filling them about three-quarters of the way to the top to allow for rising.
Bake for 20 to 25 minutes, or until the muffins are set in the center and the tops have turned a light golden brown.
Allow the muffins to cool in the pan for 5 minutes before using a silicone spatula to gently pop them out and serve.