In a small bowl, combine pretzels, butter and sugar. Press into an ungreased 13” x 9” baking dish.
Bake for 8 minutes. Remove from oven and place dish on wire rack to cool while preparing brownie mix.
Reduce oven to 350 degrees.
Prepare brownie mixes according to directions. Pour over pretzel crust. Bake for 35-40 minutes or until a toothpick inserted near the center comes out with moist crumbs (do not overbake). Place on wire rack until completely cool.
Melt chocolate chips & peanut butter in microwave; stir until smooth. Spread over brownies. Chill 30 minutes to make it easier to cut into bars. Allow to come to room temperature prior to serving to enjoy the richest flavor.