This was yummy, ooey, and gooey. I made a couple of modifications: I used ricotta, not cottage cheese, and just dumped a few dollops here and there. I left out the American cheese entirely... it's already such a cheesy dish that you won't even miss it. I sprinkled some bottled parm on the top, which fine as a substitute for the fresh. I didn't use meat-flavored sauce, but I threw in some soy crumbled beef substitute to make it a vegetarian dish without seeming like a vegetarian dish!
Also, the composition turned out better in the metal baking pan I used than in the ceramic casserole dish. Not sure why, but it was less watery in the metal pan.