In a medium bowl mix together, melted butter,rice crisps, and powder sugar, 1 cup of peanut butter until well mixed. Press evenly on the bottom or a ungreesed 9x13 pan

In a metal bowl, over simmering water, or in a microwave melt the chocolate chips and the remaining peanut butter, stir till smooth. Spread over prepared crust. Refrigerate until the chocolate has harden

Optional: You can also if you want add some Reese's peanut butter cups on top.