01 - Preheat oven to 350°F. Lightly grease a standard 12-cup muffin tin or line with silicone liners.
02 - Heat a skillet over medium. Cook turkey sausage, breaking it apart with a spatula, until fully cooked and browned. Drain any excess fat.
03 - Add diced red bell pepper and chopped spinach to the skillet. Sauté for 2–3 minutes, until vegetables are softened. Remove pan from heat and allow mixture to cool slightly.
04 - In a large mixing bowl, whisk eggs, milk, garlic powder, paprika, salt, and pepper until fully combined.
05 - Stir the cooked sausage and vegetables, green onions, and shredded cheddar cheese into the egg mixture until evenly incorporated.
06 - Divide the mixture evenly among the muffin cups, filling each about three-quarters full.
07 - Bake for 20–25 minutes, or until muffins are set and lightly golden on top.
08 - Cool muffins in the tin for 5 minutes before carefully removing. Serve warm, or cool completely for storage.