use 1/2 as much milk as required and make pudding. Mix in cool whip & vanilla. Lay out graham crackers neatly on bottom of 13x7 pan. Spread a layer of pudding mix. Repeat layers. Makes 4 or 5 layers - end with crackers. Microwave icing for 15 seconds. Pour the icing over the top layer of crackers. Chill for several hours.