Preheat your oven to 375°F and lightly grease a small oven-safe baking dish with a touch of olive oil.
Heat the olive oil in a skillet over medium heat, then add the ground turkey, diced onion, and diced bell pepper.
Sauté until the turkey is thoroughly browned and the vegetables have softened, using a spatula to break the meat into small crumbles.
Add the chopped spinach, dried sage, garlic powder, sea salt, and black pepper to the skillet, stirring until the spinach is just wilted.
Transfer the turkey and vegetable mixture into the prepared baking dish, spreading it out into an even layer.
In a small mixing bowl, whisk together the whole eggs and egg whites until well combined, then pour the mixture evenly over the turkey.
Bake for 20-25 minutes or until the eggs are completely set in the center and the edges are beginning to turn a light golden brown.