Preheat oven to 375°F (190°C) and lightly grease a small oven-safe baking dish.
Heat the olive oil in a skillet over medium heat, then add the ground turkey and diced onion.
Cook the turkey until browned, breaking it into crumbles, then stir in the diced red bell pepper and cook for 3 minutes.
Add the fresh baby spinach to the skillet and stir until just wilted, then remove the pan from the heat.
In a medium bowl, whisk together the large eggs, egg whites, sea salt, black pepper, garlic powder, and dried oregano.
Spread the turkey and vegetable mixture evenly into the prepared baking dish.
Pour the egg mixture over the turkey and vegetables, ensuring everything is submerged.
Bake for 20-25 minutes or until the eggs are set in the center and slightly golden on top.