Yes - but I find they are MUCH nicer made from the lemon bar - you end up with lovely lemony crunchy biscuits.
Cut bar into 12 pieces and put 3 at a time in the micro for about 20secs till they bubble right up. Then take them out and let them cool. If you leave them in until the first one goes a little tanned on the top, then they should all be nice and crunchy when cold.