01 - Line a 9x13-inch baking pan with parchment paper, ensuring an overhang on all sides for easy retrieval.
02 - In a sizable mixing bowl, combine the melted butter, graham cracker crumbs, powdered sugar, and 1 cup of peanut butter. Stir until a cohesive, dough-like consistency is achieved.
03 - Transfer the peanut butter mixture into the prepared pan. Press it down evenly to create a uniform base, and smooth the surface with a spatula.
04 - In a microwave-safe dish, combine the chocolate chips and ½ cup of peanut butter. Heat in 30-second increments, stirring thoroughly between each interval, until completely melted and smooth.
05 - Gently pour the melted chocolate mixture over the peanut butter base. Spread it evenly across the entire surface.
06 - Refrigerate the bars for a minimum of 40 minutes, or until the chocolate topping has solidified.
07 - Utilize the parchment paper overhang to lift the bars from the pan. Cut into individual servings and present.