1. Cover tray or cookie sheet with wax paper.
2. Place peanut butter chips, chocolate chips and shortening in medium microwave-safe bowl. Microwave at MEDIUM (50%) 1-1/2 to 2 minutes or until chips are melted and mixture is smooth when stirred. Using fork, dip each cookie into chip mixture; gently tap fork on side of bowl to remove excess chocolate.
3. Place coated cookies on prepared tray; top each cookie with graham snack cracker. Refrigerate, uncovered, until chocolate is set, about 30 minutes. Store in airtight container in cool, dry place. Makes about 48 cookies.