Preheat your oven to 375°F and lightly grease a small oven-safe baking dish with a touch of olive oil.
Heat the teaspoon of olive oil in a skillet over medium heat, then add the diced yellow 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, and cook until fully browned.
Stir in the fresh baby spinach and cook for 1 minute until just wilted, then remove the skillet from the heat.
In a separate mixing bowl, whisk together the eggs, Greek yogurt, sea salt, black pepper, and garlic powder until the mixture is smooth and well combined.
Spread the sausage and vegetable mixture evenly across the bottom of the prepared baking dish.
Pour the egg and yogurt mixture over the top, using a fork to ensure the liquid is distributed through the meat and vegetables.
Place the dish in the oven and bake for 20-25 minutes, or until the eggs are set in the center and the edges are lightly golden brown.