Preheat your oven to 375°F (190°C) 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, diced onion, and red bell pepper, sautéing until the vegetables are slightly softened and fragrant.
Add the ground turkey sausage to the skillet, breaking it apart with a spatula, and cook until browned and no longer pink.
Stir in the fresh baby spinach and cook for 1 minute until just wilted, then remove the skillet from the heat.
In a medium bowl, whisk the eggs with sea salt, black pepper, and garlic powder until well combined and frothy.
Transfer the sausage and vegetable mixture into the prepared baking dish, spreading it out into an even layer.
Pour the whisked egg mixture over the sausage and vegetables, ensuring everything is evenly coated.
Bake for 15-20 minutes, or until the eggs are set and the top is lightly golden and firm to the touch.