Preheat oven to 350°F. Cook sausage, mushrooms and bell pepper in large skillet over medium-high heat 8-10 minutes or until sausage is thoroughly cooked, stirring frequently; drain.
Beat eggs, milk and black pepper in large bowl with wire whisk until well blended. Stir in sausage mixture, cheese, and green onion. Line cupcake pans with 16 baking liners. Spoon mixture evenly into baking cups.
Bake 18-22 minutes or until toothpick inserted in center comes out clean. Let stand 5 minutes before serving.