Here the recipe I use for mmf
1 1/2 bag of small marshmallows about 16 onz
2 tbs water
2 tsp corn syrup
1 tsp clear vanilla
5 to 51/2 c confectioners sugar(powder)
1/4 c vegetable shortening
Grease a glass bowl, wooden spoon, & k.a.m(mixer) metal bowl. Microwave marshmallows & water for 40 seconds at a time, about 2 minutes. Stirring until fully melted. Immediately add corn syrup,vanilla & what's left of the shortening to melted marshmallows. Mix well , transfer to metal bowl .Add 2 c sugar. Mix with dough hook. While mixing add the rest of sugar 1 cup at a time until all incorporated. Transfer fondant to silicone mat,or counter top. knead it about 2 minutes . It will be soft. Double wrap in plastic . Let it rest 6 hrs. or over night. ** for chocolate mmf use 4 to 4 1/2 c sugar plus 1/4 c cocoa. Fondant covered 2 cakes. Each cake was 9x2 doubled. Love this recipe, easy to roll out.