Frozen Yogurt Pie
["2 (8 oz.) containers low-fat yogurt (any flavor)", "1 (8 oz.) frozen whipped topping, thawed", "18 graham cracker squares", "1/4 c. sugar", "6 Tbsp. margarine"]
["Grind graham crackers into fine crumbs.", "Add sugar and melted margarine.", "Press into pie plate and chill 1 hour or bake at 375\u00b0 for 6 to 10 minutes and then cool thoroughly.", "Fold whipped topping and yogurt together and spoon into crust.", "Chill and serve."]
["containers", "frozen whipped topping", "graham cracker squares", "sugar", "margarine"]