Chill bowl and beaters and evaporated skim milk. Whip evaporated milk until peaks form when you lift the beaters away from the mixture. Add sugar and vanilla and mix well. For firmer topping, add one and one-half tsp. unflavored gelatin, dissolved in a small amount of warm milk, to chilled milk before whipping. Chill topping to firm it. Serve over fresh fruit for a low calorie dessert.
Whipped topping made with one tablespoon of whipping cream has 52 calories and 5.5 grams of fat. The substitute made with one tablespoon of evaporated milk has 13 calories and 0 grams of fat.