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 and add the ground turkey sausage, breaking it up with a spatula until browned and cooked through.
Add the diced red bell pepper and yellow onion to the skillet, sautéing for 3-4 minutes until the vegetables are tender and fragrant.
Stir in the baby spinach and cook 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 well combined.
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 sausage and vegetables, ensuring everything is submerged and evenly distributed.
Place the dish in the oven and bake for 20-25 minutes, or until the eggs are set in the center and the top is lightly golden brown.