Step 1

Combine the melted butter, graham cracker crumbs, and powdered sugar in a mixing bowl, then stir in peanut butter.

Step 2

Spread the peanut butter mixture into a 9x13" baking dish and press firmly into an even layer.

Step 3

Microwave the chocolate chips until melted and smooth.

Step 4

Spread the melted chocolate evenly over the peanut butter layer.

Step 5

Chill until completely firm, about 3 hours.