01 - Line an 8x8 inch baking pan with parchment paper, ensuring excess paper extends over edges for effortless removal.
02 - In a large bowl, thoroughly combine melted unsalted butter and 1 cup creamy peanut butter until smooth.
03 - Stir powdered sugar and graham cracker crumbs into the peanut butter mixture. Add vanilla extract and mix until a cohesive, thick dough forms.
04 - Transfer dough to prepared pan and press evenly into corners, smoothing the surface with a spatula.
05 - Combine chocolate chips and 1/4 cup creamy peanut butter in a microwave-safe bowl. Melt in 30-second intervals, stirring after each, until fully smooth.
06 - Pour melted chocolate mixture over peanut butter base and spread evenly. Refrigerate for at least 2 hours until set.
07 - Remove from pan using parchment overhang. Cut into sixteen bars and serve.