Ritz Cracker Pie
["3 egg whites, whipped stiff", "1 c. sugar", "1 tsp. baking powder", "1 tsp. vanilla", "20 Ritz crackers (2.5 oz.)", "1/2 c. walnuts"]
["Beat egg whites until very stiff.", "Gradually add sugar to stiff egg whites, then add baking powder and vanilla.", "Continue beating mixture at least 3 minutes; set aside.", "Crush crackers and walnuts thoroughly (a food processor with plastic blade works well); combine.", "Fold the cracker mixture into the egg white mixture.", "Spread into an 8-inch pie pan, greased with butter. Bake for 30 minutes at 350\u00b0.", "Cool.", "Top with whipped cream."]
["egg whites", "sugar", "baking powder", "vanilla", "crackers", "walnuts"]