I know what your thinking (jar icing is she nuts!!!!) but I have this jar of duncan hines icing that I would like to use up ( I'm going to decorate cupcakes) but I don't know what the consistency is does anyone know and if its to thick how do I thin it?
I don't know because I always make my own icing, but I would suggest adding corn syrup a tiny bit at a time. I probably wouldn't add liquid like I would with homemade. Maybe read the ingredients and see what was used in your icing. It might be something that you have on hand.
Let me know what you do and how it works. There are times that buying a can of icing would make a lot more sense to me for a little bit of decorating than making a new batch of buttercream.