Only 3 ingredients!
4 Cups Powdered Sugar
4 Cups Mini Marshmallows
2 Tbs. Water
Add the water to a microwavable safe bowl full of marshmallows. Put it in the microwave for 30-45 seconds. Stir the marshmallows and check for any lumps and stick in the microwave for 15 more seconds. Add the melted marshmallows into the powdered sugar and keep stirring until you can't anymore! You can now flavor your fondant or color it right now. Take it out of the bowl and put powdered sugar all over your work surface and start kneading it until it is no longer sticky. Then it is finished! Make sure you wrap it properly so it keeps the moisture in!
I would also use it right after you make it since it is so fresh. I used this fondant for my spring cake and it was tough to get it colored and I had to put it in the microwave to warm it up. I don't think I would have had trouble if I used it the same day I made it. So this is a good alternative if you ran out of fondant and needed to make more!