Mix crushed crackers, pretzels, nuts, 1 tbls lime zest and sugar together. Add melted butter. stir until everything is wet. Dump into greased cast iron skillet and press into bottom and sides to form a crust. Freeze for at least 30 minutes.
Blend with mixer cream cheese and confectioners' sugar. Add Key Lime juice, orange zest, orange juice, and 1 tbls of lime zest (or more to taste). Make sure it is all well incorporated. Throw in a handful of white chocolate chips (optional). Fold in thawed whipped topping.
Pour in filling mixture, sprinkle lime zest on top and freeze for 5 hours or until really firm.
Mix crushed pretzels, white chocolate chips, and more lime zest (if desired) together and sprinkle on thawed pie. Decorate with lime slices (optional). Cut, Serve, and Smile!