Fondant with marshmallows and powdered sugar

1 bag minature marshmallows (melted)
powdered sugar
1/2 tsp vanilla or almond extract

melt the marshmallows, stir until smooth and cool enough to touch. Add powdered sugar in portions until the mixture becomes workable with your hands.

I would recommend stirring until it comes together to the point you can't anymore to avoid this.
Then pick up the ball and keep working in the powdered sugar until it is not longer sticky and you can easily roll it out with a rolling pin. Cut and shape and place on your cake.