Preheat your oven to 375°F and lightly grease a small oven-safe baking dish with a small amount of oil.
Place a skillet over medium heat, add the olive oil, and sauté the diced onion and bell pepper until they become tender and fragrant.
Add the ground turkey to the skillet, breaking it apart with a wooden spoon, and cook until it is fully browned and no pink remains.
Stir in the chopped baby spinach and cook for 1 minute until it just begins to wilt, then remove the skillet from the heat.
In a medium mixing bowl, whisk together the large eggs, egg whites, sea salt, black pepper, garlic powder, and dried oregano until well combined.
Spread the cooked turkey and vegetable mixture evenly across the bottom of the prepared baking dish.
Pour the egg mixture over the turkey and vegetables, tilting the dish slightly to ensure the eggs settle into all the crevices.
Place the dish in the oven and bake for 20 to 25 minutes, or until the eggs are completely set in the center and the edges are slightly golden.