Preheat oven to 350°.
In a large skillet, cook sausage over medium heat until no longer pink; 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 muffin cups coated with cooking spray.
Bake 20-25 minutes or until a knife inserted near the center comes out clean.
Freeze option: Cool baked egg muffins. Cover and place on waxed paper-lined baking sheets and freeze until firm. Transfer to resealable plastic freezer bags; 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. Yield: 1 dozen.