Mix pretzel crumbs, 1/4 cup sugar and butter; press onto bottom of 13x9-inch pan. Bake 10 min.; cool completely. Meanwhile, beat dry pudding mixes, milk and 3/4 cup peanut butter in medium bowl with whisk until well blended. Stir in 3/4 cup COOL WHIP.
Spread 3/4 cup peanut butter mixture over crust; top with bananas and remaining pudding mixture.
Whisk remaining peanut butter and half of the remaining COOL WHIP in separate medium bowl until well blended. Stir in remaining COOL WHIP; spread over dessert. Refrigerate 2 hours. Top with whole pretzels just before serving.