I frequently end up with bits and pieces of leftover chicken. I will sometimes freeze this after dicing it and it works great in various casseroles, creamed chicken, chicken pot pies, etc. Tonight I needed something that could be ready quickly after swim team practice for my eldest. i had barbecued some marinated chicken breasts for dinner on Sunday, had made chicken salad sandwiches one day, and used the leftovers tonight in Chicken Quesadillas. I diced up the chicken and mixed it with some chili powder and garlic and added a bit of leftover broth for moisture and then microwaved it in a covered dish for a few minutes. I put two flour tortillas on a cookie sheet and divided the chicken between the two and spread them out. Sprinkled some grated Cheddar cheese on top and put another tortilla on top of each, then baked at 450 for 5 minutes or so, until they were lightly browned. I cut them into wedges and served with some sour cream and salsa.
If I have some avocados, I always make up some guacamole, too.