Preheat your oven to 375°F and lightly grease a small oven-safe baking dish.
In a medium skillet, heat the olive oil over medium heat.
Add the ground turkey to the skillet along with the dried sage, garlic powder, sea salt, and black pepper.
Cook the turkey, breaking it into small crumbles with a spatula, until it is browned and cooked through.
Add the diced yellow onion and red bell pepper to the skillet, sautéing for 3-4 minutes until the vegetables are softened.
Stir in the fresh spinach and cook for 1 minute until just wilted, then remove the skillet from heat.
Transfer the turkey and vegetable mixture into the prepared baking dish, spreading it into an even layer.
In a small bowl, whisk together the large eggs and egg whites until smooth and well combined.
Pour the egg mixture evenly over the turkey and vegetables in the baking dish.
Bake for 20-25 minutes, or until the eggs are completely set in the center and the top is lightly golden brown.