Line tray with wax paper. Place butterscotch chips, peanut butter chips and shortening in medium microwave-safe bowl.
Microwave at MEDIUM (50%) 1 minute; stir. If necessary, microwave at MEDIUM an additional 15 seconds at a time, stirring after each heating, just until chips are melted and mixture is smooth when stirred.
Immediately add chow mein noodles; stir to coat. Drop mixture by heaping teaspoons onto prepared tray or into paper candy cups; let stand until firm. If necessary, cover and refrigerate until firm. Store in tightly covered container in refrigerator. Yields about 2 dozen candies.
CHOCOLATE HAYSTACKS: Substitute 1 cup HERSHEY'S SPECIAL DARK Chocolate Chips, HERSHEY'S Semi-Sweet Chocolate Chips or HERSHEY'S Milk Chocolate Chips for butterscotch chips. Proceed as directed above with peanut butter chips, shortening and chow mein noodles.