In a large mixing bowl, combine the melted, slightly cooled butter with the creamy peanut butter. Stir until smooth and fully blended. Next, add the powdered sugar and graham cracker crumbs. Mix everything together until you get a thick, crumbly dough that holds when pressed.
Line your 9x13 inch baking pan with parchment paper, leaving some overhang for easy removal later. Transfer the peanut butter mixture into the pan and press it down firmly and evenly, creating a compact base layer.
In a microwave-safe bowl, combine the chopped chocolate and 1/4 cup creamy peanut butter. Heat in 30-second intervals, stirring between each, until the mixture is smooth and glossy.
Pour the melted chocolate and peanut butter mixture over the prepared base. Use a spatula to spread it evenly, covering every corner.
Sprinkle the chopped roasted peanuts evenly over the melted chocolate layer. Gently press them down to ensure they stick as the chocolate cools.
Place the baking pan in the refrigerator for at least 2 hours or until the bars are completely firm. Once set, use the parchment paper overhang to lift the bars out of the pan. Cut into squares or rectangles and enjoy!