I can't do corn, but tried a Bob's Red Mill mix for chocolate cake that I could actually eat. Frosted it with a recipe I found called: 7-minute Icing Recipe
* 4 egg whites
* 1 1/2 cup sugar
* 1/4 cup plus 1 Tbsp cold water
* 1 tsp cream of tartar
* 1/8 tsp salt
* 1 1/2 tsp vanilla
Sadly, it was gross. The icing was... grainy, not creamy. Probably since there is no butter.
I used to make icing with powdered sugar, butter, vanilla, water/milk. It was great. But all the powdered sugar I can find has corn starch in it. Anyone have a solution to this? I was considering trying to throw granulated sugar in the blender, to see if I could make it into more of a powder, but that seems pretty unlikely. (I think it will just be well blended granulated sugar). Help!
