1/4 cup butter
1 16 oz pkg marshmallows
1/4 cup water
1 tsp vanilla extract
2 pounds powdered sugar
Melt marshmallows in microwave for 30 second intervals until melted. Add the water and vanilla and stir until smooth. Add powdered sugar a little at a time until the dough is sticky. Use powdered sugar for kneading. The dough should be stiff.
Coat your hands with butter and knead the dough until smooth and not sticky, five to ten minutes.
Wrap in plastic wrap and refrigerate until needed. Let is sit out and come to room temperature and roll out onto surface dusted with powdered sugar.
You may add food coloring and you can stamp designs into it.