Here is a really easy solution to your situation.
Allrecipes.com will adjust ingredient measurements for you on almost all of their recipes.
Not only ^that, but the site also can calculate English or metric measurements!
So if you find a Vanilla frosting recipe there , just adjust the serving size!.
I hope this helps.
(by the way, I bet there are others in the class that prefer Vanilla over Chocolate, so don't make too few.)
This makes about 1/4 cup of frosting, which should be just enough!:
1/2 cup powdered sugar
1/2 tablespoon butter or 1/2 tablespoon margarine, softened
1/2 tablespoon milk
1/8 teaspoon vanilla
Combine and beat on medium speed until light and fluffy.
You're welcome Wiigirl.
I'm so glad I could help.
And Thank You for choosing a Best Answer