BEAT brownie mix, chocolate chips and water in bowl of mixer fitted with paddle attachment on medium-low speed until well blended.
SHAPE into 104 balls (or into 52 balls for trial recipe), using #50 scoop. Coat with 1 qt. of the powdered sugar (or 2 cups of the powdered sugar for trial recipe). Place, 3 inches apart, in parchment paper-lined sheet pans.
BAKE in 300ºF-convection oven 10 to 12 min. or until centers are set. Cool 2 min. in pans. Remove to wire racks; cool completely.
BEAT cream cheese in bowl of mixer fitted with paddle attachment on medium-low speed until creamy; scrape bowl. Blend in peanut butter, cream and remaining 1 cup powdered sugar (or remaining 1/2 cup powdered sugar for trial recipe). Fold in whipped topping.
FILL each of 2 cookies with about 1-1/2 Tbsp. of the cream cheese mixture to make sandwich. Keep refrigerated.