Preheat oven to 350°. In a large skillet, cook sausage over medium heat until no longer pink, breaking it into crumbles; drain., In a large bowl, beat eggs. Add onion, green pepper, salt, garlic powder and pepper. Stir in sausage and cheese., Spoon by 1/3 cupfuls into greased muffin cups. Bake until a knife inserted in the center comes out clean, 20-25 minutes. Freeze option: Cool baked egg muffins. Place on waxed paper-lined baking sheets, cover and freeze until firm. Transfer to freezer container; return to freezer. To use, place in greased muffin pan, cover loosely with foil and reheat in a preheated 350° oven until heated through. Or microwave each muffin on high 30-60 seconds or until heated through.