1Heat oven to 375°F. Generously grease 24 mini (1 3/4x1-inch) muffin cups with shortening or cooking spray.
2In small bowl, stir Bisquick mix and butter until blended. Add boiling water; stir vigorously until soft dough forms. Press rounded teaspoonful of dough on bottom and up side of each muffin cup. Divide bacon evenly among muffin cups.
3In small bowl, beat half-and-half and egg until well blended. Stir in onions, salt and red pepper. Spoon 1 1/2 teaspoons egg mixture into each muffin cup. Sprinkle cheese over tops.
4Bake about 20 minutes or until edges are golden brown and centers are set. Cover; refrigerate any remaining appetizers.