BOSTON -- A Peabody woman says a cupcake she tried to take on a flight with her sparked a potential security threat this week. Rebecca Hains says she was going through security at the airport in Las Vegas when a TSA agent pulled her aside and said the cupcake frosting was “gel-like” enough to constitute a security risk. She said she was able to pass through Logan International Airport security with two cupcakes, but she was stopped on the way back when she tried to return with one of them.