In a bowl, combine melted butter, 1 ½ cups creamy peanut butter, graham cracker crumbs, and powdered sugar until everything is well blended and smooth.

Transfer the peanut butter mixture into a greased pan, smoothing it out evenly with a spatula.

In another bowl, melt the chocolate chips along with ⅔ cup of creamy peanut butter. Stir continuously until the mixture is silky and smooth.

Carefully pour the melted chocolate mixture over the peanut butter layer in the pan and spread it evenly.

Place the pan in the refrigerator until fully set—approximately 2 hours.