Marshmallow Frosting

Directions

1. 1
   Place first 3 ingredients in top of double boiler.
2. 2
   Place over boiling water and beat with egg beater 10 minutes or until thick, adding marshmallow as it begins to thicken.
3. 3
   Beat until smooth. Remove from fire; add flavoring.
4. 4
   Beat until thick and nearly cold. Add baking powder.
5. 5
   Continue to beat until thick enough to spread on cake without running.