I take quesadillas a lot--always go home with an empty plate. no mess foods are always good and they are EASY and cheap!
you need bag of flour tortillas, 3 cups bag of shreded mex cheese, 1 can blk beans (rinsed and drained) and a scallion or 2. add a jar of salsa and a side of sour cream or guacamole, and its a great hit!
basically--I add cheese, beans and sliced scallions on 1 tortilla thats in a frying pan (no oil or grease) top with another tortilla, and cook over med heat until lightly "toasted" or just browned.
NOTE:for speedy production--mix the cheese, beans and scallions into a bowl, and just add the mixture as you make each quesadilla.
Cut in half, then cut them into 1/4's then again into 1/8's (think mini pizza triangles.
arrange on a plate/platter, add side dished of your salsa and guac, or sour cream, and you are good to go. you can take off the condiments at the office and re-heat just until warm if you like. garnish with a healthy spring of cilantro.
good luck!