Preheat your 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 diced onion and red bell pepper.
Sauté the vegetables for 3-4 minutes until they begin to soften and become fragrant.
Add the ground turkey sausage to the skillet, breaking it into small crumbles with a spatula as it browns.
Once the sausage is fully cooked, stir in the baby spinach and cook just until it wilts.
In a medium mixing bowl, whisk together the whole eggs, liquid egg whites, sea salt, black pepper, and garlic powder until well combined.
Spread the sausage and vegetable mixture evenly across the bottom of the prepared baking dish.
Pour the egg mixture over the sausage and vegetables, ensuring everything is submerged.
Bake for 20 to 25 minutes, or until the center is firm and the top is slightly golden brown.
Allow the bake to cool for 5 minutes before slicing and serving.