Line a 9x13-inch baking pan with parchment paper.
In a large bowl, combine crushed pretzels, melted butter, peanut butter, and powdered sugar until well blended.
Press the mixture evenly into the prepared pan.
Melt the chocolate chips and 2 tablespoons peanut butter in a microwave-safe bowl, stirring until smooth.
Spread the chocolate mixture over the peanut butter layer.
Chill in the refrigerator for at least 1 hour before cutting into bars.