Peanut Butter Chiffon Pie
["3/4 c. finely chopped pretzel crumbs", "3 Tbsp. sugar", "3 Tbsp. melted butter", "1 envelope unflavored gelatin", "1/4 c. sugar", "1/4 tsp. salt", "1 c. milk", "2 egg yolks, slightly beaten", "1/2 c. creamy peanut butter", "2 egg whites", "1/4 c. sugar", "2 c. Cool Whip, thawed (one 4 1/2 oz. carton)"]
["Combine crumbs, 3 tablespoons sugar and 3 tablespoons melted butter.", "Press firmly into a 9-inch pie pan.", "Bake at 350\u00b0 for 8 minutes. Cool."]
["pretzel crumbs", "sugar", "butter", "unflavored gelatin", "sugar", "salt", "milk", "egg yolks", "peanut butter", "egg whites", "sugar"]