Preheat oven to 350*F. Cook sausage, mushrooms, and bell pepper in skillet over medium heat. Cook 8-10 minutes, or until sausage is throughly cooked. Drain. Beat eggs, milk, and pepper until well blended. Stir in sausage mixture, cheese, and green onions. Line each cupcake pan with parchment paper, spoon in mixture. Cook for 18-22 minutes, or until toothpick comes out clean.