1/3 cup butter or margarine, melted
3 tablespoons sugar
1 can (14 oz) sweetened condensed milk
1/2 cup Key lime juice
1 container (8 oz) frozen whipped topping, thawed
Heat oven to 350°F. In small bowl, mix graham cracker crumbs, butter and sugar. Press in bottom and up side of 9-inch glass pie plate. Bake 8 to 10 minutes or until golden brown; cool. In large bowl, beat milk and lime juice with electric mixer on medium speed until smooth and thickened. Fold in whipped topping. Spoon into cooled pie crust. Cover and refrigerate about 1 hour or until set. Store in refrigerator.