Heat oven to 350 degrees. Prepare brownie batter as directed on package. Spoon into 20 paper-lined muffin cups. Beat cream cheese, sugar, egg, peanut butter and vanilla with mixer until blended. Spoon 1 tbsp into center of batter in each cup, pressing lightly into batter. Bake 30 min. or until centers are set. Cool. Top with dollop of cool whip. |