Here's a recipe that was originally posted on this forum and I'm sorry I don't know who posted it.
3 T. meringue powder
6 T. water
1 T. cream of tartar
1 tsp vanilla
1-1 1/2 lbs. of powdered sugar
2 c. tightly packed marshmallows
8 pkgs. Knox gelatin
1 c. hot water
Mix first 4 ingredients until smooth.
Add powdered sugar and beat until thick.
Add melted marshmallows.
Put gelatin into separate bowl. Add hot water to gelatin.
Whisk until lumps are gone.
Add powdered sugar mixture by straining.
Whisk until smooth.
*There doesn't seem to be any direction on how to melt the marshmallows.
(Mod edited to separate ingredients from mixing directons.)