Preheat the oven to 425 degrees F.
In a large mixing bowl, combine the flour, pretzels, salt, and butter until texture is crumbly. Add water, and mix well. Roll with rolling pin until you have a nice thin even crust, large enough for a deep-dish pie plate. Place in pie plate (crust is very fragile and will fall apart but pinches back together nicely) flute edges, poke with fork and bake for 12 minutes. Cool completely.
In medium mixing bowl, combine cream cheese, powdered sugar, and 1 cup whipped topping. Spread cream cheese mixture on top of the cooled pretzel crust. Slice bananas on top of cheese mixture. Mix pudding and milk, pour immediately over bananas. Top with remaining 3 cups whipped topping. Refrigerate for 1 hour before serving and garnish with crushed pretzels.
Recipe courtesy of Jodi Miller