If the Chapati is only a day old, simply heat a flat griddle or pan on a medium flame and reheat. Flip frequently to prevent scorching. If you're lucky the Chapati will puff again!
If the Chapati is more than a day old, sprinkle with a little water, wrap in a damp cloth and microwave on High for a minute. Remove from the microwave and unwrap. Now roast on a hot griddle or pan, making sure to flip occassionally.

