Preheat your oven to 375°F (190°C) and lightly grease a small oven-safe baking dish.
Heat the avocado oil in a non-stick skillet over medium heat. Add the ground turkey sausage, diced onions, and diced bell peppers.
Sauté for 5-7 minutes until the turkey is browned and cooked through and the vegetables are tender.
Stir in the baby spinach and cook for 1 minute just until wilted, then remove the skillet from the heat.
In a medium bowl, whisk together the whole 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 evenly.
Pour the egg mixture over the sausage and vegetables. Sprinkle the shredded sharp cheddar cheese evenly over the top.
Bake for 15-20 minutes, or until the eggs are set in the center and the cheese is melted and golden.
Allow the bake to cool for 5 minutes before slicing and serving.