For an 8-inch square pan:
Use two cooked chicken breasts (see previous recipe), and cut them into cubes. Cube up Swiss cheese and ham lunch meat. Mix these all together and put into the pan. Use the amount that looks right for the proportions you want.
Top with a mixture of mayo and Dijon mustard. I usually do about 3:1 ratio for this, but taste it. You can use as much or little as you want.
Then sprinkle some small flavored bread crumbs on top (I just use the canned Italian flavor ones). Fairly sparse layer.
Bake at 350 degrees until the cheese is nicely melted and the casserole is hot, about 15 min or so.