1Make 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.
2Reserve 1 cup melted candy. Dip tip of 1 lollipop stick about 1/2 inch into remaining melted candy and insert stick into 1 brownie ball no more than halfway. Repeat. Return to cookie sheet. Refrigerate 30 minutes. Remove from refrigerator a few at a time. Dip balls in melted candy; tap off excess. Let stand until set.
3Spoon reserved melted candy into resealable food-storage plastic bag; seal bag. Cut off small corner of bag; squeeze bag to pipe crisscross patterns onto balls to look like mummy. Immediately attach candy eyes. Poke opposite end of stick into foam block. Let stand until set.