Preheat your oven to 350°F and lightly grease a standard muffin tin with a small amount of oil or non-stick spray.
Place a non-stick skillet over medium-high heat and add the ground turkey breast, cooking until browned and crumbled through.
While the turkey cooks, finely chop the fresh spinach and the green onion.
In a medium mixing bowl, whisk together the egg whites, ground flaxseed, tamari, ground ginger, garlic powder, sea salt, and black pepper until well combined.
Stir the cooked turkey, chopped spinach, and green onion into the egg white mixture.
Distribute the mixture evenly among 4 to 6 muffin cups, depending on your preferred size.
Bake for 15 to 18 minutes, or until the egg whites are fully set and the centers are firm to the touch.
Let the bites cool in the tin for 5 minutes before carefully removing them with a silicone spatula.