Preheat oven to 375°F and lightly grease a small oven-safe baking dish with a bit of oil.
Heat olive oil in a skillet over medium heat and sauté the diced sweet potato for 5 minutes.
Add the ground turkey sausage, diced onion, and bell pepper to the skillet, cooking until the meat is browned.
Stir in the fresh spinach until it just begins to wilt, then remove from heat.
Transfer the sausage and vegetable mixture into the prepared baking dish, spreading it evenly.
In a bowl, whisk together the egg, egg whites, sea salt, black pepper, garlic powder, and oregano.
Pour the egg mixture over the ingredients in the dish and bake for 25 minutes until the center is firm.