Preheat your oven to 375°F and lightly grease a small oven-safe baking dish with a touch of olive oil.
In a skillet over medium heat, add the olive oil and brown the turkey sausage until fully cooked, breaking it into small crumbles as it browns.
Add the diced onions and bell peppers to the skillet and sauté for 3-4 minutes until the vegetables are tender and fragrant.
Stir in the fresh baby spinach until just wilted, then remove the skillet from the heat to cool slightly.
In a medium mixing bowl, whisk together the whole eggs, egg whites, sea salt, black pepper, and garlic powder until the mixture is well combined and slightly frothy.
Transfer the sausage and vegetable mixture into the prepared baking dish, spreading it out into an even layer.
Pour the egg mixture over the sausage and vegetables, ensuring the liquid settles into all the crevices of the dish.
Bake for 20-25 minutes or until the center of the bake is firm to the touch and the edges are a light golden brown.