With electric mixer, blend together the first four ingredients as the peanut butter mixture.
Prepare one 5-ounce box of chocolate pudding according to directions on box and divide evenly into 25 clear punch-size plastic cups.
Whip heavy whipping cream with electric mixer and evenly spread in each cup as the next layer.
Reserve 1/3 Oreos. Sprinkle remainder on top of whipping cream as next layer in each cup.
Divide peanut butter mixture evenly among the cups and spread evenly with a spoon.
Prepare the other 5-ounce box of chocolate pudding and spread as next layer.
Sprinkle reserved Oreos and chopped Reese’s cups on top.
Chill one to three hours. Makes 25 cups.