Fluffy Frosting(Diabetic Recipe)

Combine sugar, water, sugar replacement, egg whites and cream of tartar in top of a double boiler; beat at high speed for 1 minute.

Set over simmering water in the bottom of the double boiler.

Continue to beat at high speed for 4 to 5 minutes, or until soft peaks form.

Remove from heat.

Add vanilla to frosting; continue beating at high speed 1 to 2 minutes, or until thick enough to spread on a cooled cake.