Preheat your oven to 375°F and lightly grease a small oven-safe baking dish with a touch of olive oil.
In a skillet over medium heat, add the olive oil and sauté the diced red onion and bell pepper until they begin to soften.
Add the ground turkey to the skillet, breaking it up with a spatula, and cook until browned and fully cooked through.
Stir in the baby spinach and cook just until wilted, then remove the skillet from the heat.
In a medium bowl, whisk together the eggs, egg whites, sea salt, black pepper, garlic powder, and red pepper flakes until well combined.
Transfer the cooked turkey and vegetable mixture into the prepared baking dish, spreading it out into an even layer.
Pour the egg mixture over the turkey and vegetables, ensuring everything is evenly submerged.
Bake for 20-25 minutes, or until the eggs are set in the center and the edges are slightly golden brown.