Preheat your oven to 375°F (190°C) and lightly grease a small oven-safe baking dish with a touch of oil.
In a medium skillet over medium-high heat, add the olive oil, diced onion, and bell pepper, sautéing for 3-4 minutes until the vegetables are softened and fragrant.
Add the ground turkey sausage to the skillet, breaking it apart with a spatula, and cook until browned and no longer pink.
Stir in the fresh baby spinach and cook for about 1 minute just until wilted, then remove the skillet from the heat.
In a medium mixing bowl, whisk together the large eggs, liquid egg whites, sea salt, black pepper, and garlic powder until the mixture is well combined and slightly frothy.
Transfer the cooked sausage and vegetable mixture into the prepared baking dish, spreading it out into an even layer.
Pour the egg mixture over the top of the sausage and vegetables, ensuring the liquid is distributed evenly throughout the dish.
Bake for 20-25 minutes, or until the center of the bake is set and the top is lightly golden brown.
Allow the bake to cool for 5 minutes before slicing and serving to ensure it holds its shape.