Make and bake brownie mix as directed on box for cakelike brownies, using water, oil and eggs. Cool. Line cookie sheet with waxed paper. In small bowl, mix frosting and peanut butter until blended. Crumble brownies into large bowl, discarding edges; stir in peanut-buttery candy. Add frosting mixture; mix well. Shape into 1-inch balls; place on cookie sheet. Refrigerate until firm.