Mix together the melted butter, creamy peanut butter, powdered sugar, and graham cracker crumbs in a large mixing bowl until smooth.

Line a 9×13-inch baking dish with parchment paper and press the peanut butter mixture firmly into the bottom.

Melt the semisweet chocolate chips with half a cup of creamy peanut butter in a microwave-safe bowl, stirring until smooth.

Pour the melted chocolate-peanut butter mixture over the pressed peanut butter base and spread it evenly.

Chill the baking dish in the refrigerator for at least 2 hours until the bars are firm.

Let the bars sit at room temperature for 5 minutes before slicing into squares or bars.

Enjoy the bars, sharing with friends or keeping them all to yourself.