In a bowl, mix peanut butter, melted butter, powdered sugar, graham cracker crumbs, and vanilla extract until well combined.
Press the mixture evenly into a lined baking dish.
Melt the chocolate chips and peanut butter together in a microwave-safe bowl, stirring every 30 seconds until smooth.
Pour the chocolate mixture over the peanut butter layer and spread evenly.
Refrigerate for at least 2 hours until set.
Cut into bars and enjoy!