Preheat your oven to 350°F and lightly grease a standard muffin tin with avocado oil.
In a small skillet over medium heat, cook the ground turkey until browned and fully cooked through, then set aside.
Finely dice the red bell pepper and roughly chop the baby spinach into small ribbons.
In a large mixing bowl, whisk together the whole eggs, egg whites, sea salt, black pepper, and garlic powder until the mixture is uniform.
Fold in the cooked turkey, chopped bell pepper, spinach, and shredded sharp cheddar cheese.
Distribute the egg mixture evenly among six muffin cups, filling each about three-quarters of the way to the top.
Bake for 20 to 25 minutes or until the egg muffins have risen and the centers are firm to the touch.
Allow the muffins to cool in the pan for 5 minutes before using a knife to gently release them from the edges.