Hello! I know this is an old thread, but I just wanted to say that placing the flooded cookies in an unlit oven with the light on worked like a charm!!!!! I too have the no dehydrator and going through a horrible humid weather issue. Had to dump a whole batch that never dried and start over. I scanned this blog looking for a work around and found the suggestion by Maddy D. As I finished decorating each cookie (did tie-dye cookies) I put it onto cookie sheets I'd placed in the oven and left them there. When I was completely finished decorating the whole batch (about 3 hours), I propped the door open slightly and left them in there overnight. I probably didn't need to keep the door open, but I did. It's not ideal, but until the dehydrator, worked great! Thanks for mentioning this!