Heat oven to 350 degrees F. Grease 13” x 9” pan and line with cooking parchment paper, leaving an overhang on the two longer sides. In medium bowl, prepare peanut butter cookie dough as directed on pouch. In another medium bowl, make brownie batter as directed on box. Crumble cookie dough in pan; using offset spatula, press and spread cookie dough into thin even layer. Top cookie dough layer evenly with sandwich cookies and candies, then spread brownie batter over all to cover completely. Bake about 30 minutes or until toothpick inserted in brownie comes out with few sticky crumbs. Cool completely on cooling rack.