Pot Pie
Pot pie is a good way to get rid of a bunch of random vegetables on top of your chicken, but it also feels like a heftier, more solid dinner than a broth-heavy bowl. Simply make a thick gravy or cream sauce, toss in some chopped-up cooked chicken and vegetables, and top with some kind of dough. Pot pie is a great way to stretch a small amount of leftover chicken into a large meal because you're adding so many other ingredients to it.
You have several options for the dough. If you don't want to go to the trouble of making your own pie dough, store-bought works just as well. You can also use biscuit dough, either homemade or store-bought in a refrigerated cardboard tube. Puff pastry adds a luxurious touch if you want to go in a fancier direction. You could even make a chicken shepherd's pie with mashed potatoes instead of dough.