Gather all ingredients. Line a large casserole dish with aluminum foil and spray with cooking spray. Set aside.
Place melted butter, pretzels, confectioner's sugar, and 1 cup peanut butter in a bowl. Mix together completely, then pour into prepared pan. Press evenly into the bottom of the pan.
Place chocolate chips and remaining peanut butter in a microwave-safe dish. Heat on High for 30 second intervals, stirring in between, until thoroughly melted. Pour over bars and spread evenly with a spatula.
Press additional pretzels on top, then place in the refrigerator to chill for at least 1 hour. Cut to serve.
