Step 1

Place marshmallows and 2 tablespoons of water in a large microwave-safe bowl.

Step 2

Microwave for 30 seconds on high; stir until mixed well. Continue microwaving in 30 second intervals until melted and smooth.

Step 3

Place about 5 cups of the powdered sugar on top of the melted marshmallow mixture and gently fold it into the marshmallows.

Step 4

Grease your hands and your counter generously with shortening. Turn marshmallow mixture onto counter and start kneading it like you would dough.

Step 5

Add more confectioners' sugar as needed and re-grease your hands and the counter as needed.

Step 6

If the marshmallow fondant is tearing easily, it is too dry; add water (about 1/2 tablespoon at a time) kneading it until fondant forms a firm, smooth elastic ball that will stretch without tearing.