Marshmallow Fondant

1-16 oz. pkg. good quality mini marshmallows
4 T. water
1 t. vanilla
Food Coloring (optional)
2 lbs. powdered sugar, divided
Pam spray or 4 T. butter or shortening
Place marshmallows and water in large, microwave-safe bowl and heat on high until marshmallows melt (30 seconds at a time).  Add vanilla and mix until smooth.  Add food coloring if desired.  Slowly beat in sugar, one cup at a time, until mixture is too stiff to mix.
Grease hands and kneading surface thoroughly and knead in remaining sugar.  Add spray or shortening to surface and knead until no longer sticky to the tough.
Form into ball and grease with shortening or butter.  Cover in plastic wrap and place in airtight container or zip bag, refrigerating dough overnight.  To use, bring dough to room temperature and roll on surface covered with powdered sugar or grease.
Add powdered sugar as needed to make the fondant feel doughy.