Preheat your oven to 375°F (190°C) and lightly grease a small oven-safe baking dish with olive oil.
In a medium skillet over medium-high heat, brown the ground turkey with sea salt, black pepper, garlic powder, and oregano until fully cooked.
Add the diced red bell peppers to the skillet and sauté for 3-4 minutes until they begin to soften.
Stir in the baby spinach and cook just until wilted, then remove the skillet from the heat.
In a small bowl, whisk together the large eggs and liquid egg whites until well combined.
Transfer the turkey and vegetable mixture into the prepared baking dish, spreading it out evenly.
Pour the egg mixture over the turkey and vegetables, ensuring everything is submerged.
Sprinkle the crumbled feta cheese over the top for a salty finish.
Bake for 20-25 minutes, or until the eggs are set and the top is lightly golden.
Let the bake cool for a few minutes before slicing and serving.