Wow- two posts in one day. This one is pretty dang close to whipped topping. It will definitely do the job and the kids that tasted it loved it. It takes a little bit of time to make so be sure to give yourself a couple hours before you need it.
Whipped Topping from Powdered Milk
6 T powdered milk
2 tsp plain gelatin (you could probably used flavored too)
1/4 C sugar
1 C water
1 tsp vanilla
Dissolve milk and gelatin in boiling water. Add the sugar. Stir and chill until it jells. Beat the mixture until it looks like whipped cream. Add vanilla and beat again. Store in the refrigerator until use.