HEAT oven to 350ºF. Prepare brownie batter as directed on package. Spoon into 12 paper-lined muffin cups.
BEAT cream cheese, peanut butter and sugar with mixer until blended. Spoon 1 rounded Tbsp. into centre of batter in each cup, pressing down slightly into batter. Bake 25 min. or until centres are set. Cool.
SERVE topped with Cool Whip and cherries.