Mary - from Rochester, MN
It’s possible that the powdered sugar caused the fondant to dry out faster than it should, though small amounts don’t generally do that. You don’t indicate what you used on the cake before covering with fondant. Buttercream icing assists with keeping the fondant soft, easy to cut and eat. Be sure to knead the fondant until it is soft and pliable before rolling. Next time, you can also apply a thin layer of vegetable shortening on the rolling surface, in place of the sugar.