Peanut butter fudgy bars

1. Heat oven to 350. Lightly spray 13x9 inch pan with Pam. In large bowl, combine cake mix, 1 cup peanut butter, water and egg on low speed. Mix 2 minutes on medium speed. Spread into prepared pan. Bake at 350 for 20 to 25 minutes or until puffed and light golden brown. Cool Completely. In small bowl, blend frosting with ½ cup peanut butter and spread over cooled bars Top with candy pieces and chopped peanuts.