Many small kitchen appliances can be taken on a plane as long as they can fit in an overhead bin. This includes toasters, crockpots, waffle makers, sandwich makers, and more. \
Just remember that electronic devices must be charged. If a TSA agent asks you to turn on an electrical device to ensure that it works, you must be able to do this. \
Uncharged electronic devices are a security risk, so if your small appliance cannot be powered on then you may be asked to place it inside your checked luggage. \