1. Line 8 x 8 x 2-inch baking pan with foil, extending ends over edges. Coat with cooking spray. In prepared pan combine 5 pouches KELLOGG'S POP-TARTS MINI CRISPS tasty baked bites Frosted Chocolate and butter. Firmly press onto bottom of pan. Refrigerate for 5 minutes.2. Meanwhile, in small microwave-safe bowl micro-cook peanut butter on high for 30 to 40 seconds or until melted, stirring every 20 seconds. Carefully spread over chocolate layer in baking pan. Return to refrigerator.3. In another small microwave-safe bowl combine chocolate morsels and shortening. Micro-cook on high for 1 to 1 1/2 minutes or until smooth, stirring every 30 seconds. Carefully spread over peanut butter layer. Sprinkle with 1 pouch KELLOGG'S POP-TARTS MINI CRISPS tasty baked bites Frosted Chocolate. Refrigerate for 5 to 10 minutes more or until nearly firm. Use foil to remove from pan. Cut into 15 bars. Return to refrigerator for 5 minutes or until firm. Store in airtight container in refrigerator.