Spread each muffin half with the cheeze/crab mixture.
Place under broiler and brown (WATCH CAREFULLY SO IT DOESN'T BURN).
Cut each muffin half into quarters when cool enough to handle.
(I keep a bag of these in the freezer for when unexpected guests show up. Just broil as instructed above, place on a cookie sheet to freeze, then transfer to freezer bags. When guests arrive, place in microwave to heat up and then serve).