Mystery Pie
["3 egg whites", "1/2 tsp. baking powder", "1 c. sugar", "1 tsp. vanilla", "20 Ritz crackers, finely crushed", "3/4 c. chopped pecans"]
["Beat egg whites stiff.", "Add baking powder and sugar gradually. Add vanilla and beat until very stiff.", "Fold in cracker crumbs and nuts.", "Pour into well-greased pie pan and bake at 350\u00b0 for 30 minutes.", "Let cool and top with Cool Whip."]
["egg whites", "baking powder", "sugar", "vanilla", "crackers", "pecans"]