Preheat your oven to 375°F (190°C) and lightly grease a small oven-safe baking dish with a touch of olive oil.
In a medium skillet over medium heat, add the olive oil, ground turkey, diced onion, and diced bell pepper.
Cook the mixture until the turkey is thoroughly browned and the vegetables have softened, using a spatula to break the meat into small crumbles.
Stir in the chopped baby spinach and cook for 1 minute until just wilted, then remove the skillet from the heat.
In a separate mixing bowl, whisk together the whole eggs, egg whites, sea salt, black pepper, garlic powder, and dried oregano until the mixture is well combined and slightly frothy.
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 the liquid fills all the gaps and covers the ingredients evenly.
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 lightly golden brown.
Remove from the oven and let the bake rest for 5 minutes before slicing into portions and serving warm.