Line a 9x13-inch baking pan with parchment paper or foil, leaving an overhang for easy removal.
In a large bowl, mix melted butter and peanut butter until smooth.
Add powdered sugar and mix until fully combined.
Gradually mix in graham cracker crumbs until a thick dough forms.
Press the mixture evenly into the prepared pan.
In a microwave-safe bowl, melt chocolate chips with peanut butter in 20–30 second intervals, stirring until smooth.
Pour and spread the chocolate evenly over the peanut butter layer.
Refrigerate for at least 1.5 hours until firm.
Slice into bars and enjoy your No Bake Peanut Butter Chocolate Bars.