Line a 9x13-inch baking dish with parchment paper.
In a bowl, mix melted butter, graham cracker crumbs, powdered sugar, and peanut butter until smooth.
Press the mixture evenly into the baking dish.
Melt chocolate chips and 1/4 cup peanut butter together until smooth.
Spread the chocolate mixture over the peanut butter layer.
Refrigerate for at least 2 hours or until firm.
Cut into squares and enjoy!