I make a shortbread cookie. I then ice it with royal icing and let it dry overnight. I apply the edible image using either Crisco, or piping gel. Around the edges I use either light corn syrup or piping gel to add the sprinkles. I let that dry overnight before putting them in a sealed bag.
My problem: a few days after bagging, the cookies start to look wet. Almost as if I didn't let them dry enough (overnight I thought was long enough).
I have attached a photo to show you what is happening. Any suggestions are greatly appreciated.