Line Your Pan: Start by lining an 8×8 or 9×9 inch baking pan with parchment paper, leaving an overhang on two sides for easy removal.

Make the Crust: In a medium bowl, combine the graham cracker crumbs, 1 cup of powdered sugar, and 1 cup of peanut butter. Pour in the ½ cup of melted butter and stir until the mixture is fully combined and resembles wet sand.

Press the Crust: Transfer the crust mixture to your prepared pan. Use the bottom of a measuring cup or a glass to press it firmly and evenly into the bottom of the pan.

Create the Peanut Butter Layer: In a separate bowl (or using the same one, cleaned), beat the softened ½ cup of butter and 1 cup of peanut butter together until smooth. Gradually add the 1 ½ cups of powdered sugar and vanilla extract, and beat until a thick, spreadable frosting forms.

Spread the Middle Layer: Carefully spread the peanut butter filling over the crust layer, smoothing it out into an even layer.

Make the Chocolate Topping: In a microwave-safe bowl, combine the chocolate chips and 2 tablespoons of peanut butter. Microwave in 30-second intervals, stirring well after each, until the mixture is completely melted and smooth.

Top and Chill: Pour the melted chocolate over the peanut butter layer and spread it evenly to the edges. Gently tap the pan on the counter to remove any air bubbles.

Set and Serve: Refrigerate the bars for at least 2-3 hours, or until the chocolate top is completely firm. Use the parchment paper to lift the entire block out of the pan onto a cutting board. Use a sharp knife to slice into squares. For cleanest cuts, you can warm the knife under hot water and dry it quickly before each slice.