I was going to make Tetrazinni the other night, but didn't have the stuff.
So instead I too:

Cooked and chopped chicken breast mixed with Lowfat Italian dressing.
Cooked a package of egg noodles.
Put the noodles on the bottom of a casserole, chicken and dressing on top of that, then shredded monterrey jack cheese on that.
350 oven until bubbly and brown on top.

There were no left overs.