Remove and chop mushroom stems; set aside. Brush mushroom caps with butter. Arrange round side down on baking sheet. In a bowl, combine stems, Herr's Potato Chips, onions and parsley. Mix mayonnaise, garlic, and pepper sauce. Toss with chip mixture, mound in mushroom caps. Dust with paprika. Bake in 375°F oven 8 to 10 minutes until heated through. Makes 24.