I came across a recipe like this but it called for spam so I improvised and it was very fast and easy and pretty good. I think it might be pretty good with chicken too.
1 box of mac & cheese
1 lb hamburger
1 onion, chopped
1-2 bell peppers, chopped
1 can cream of mushroom soup
prepare mac & cheese as directed. brown hamburger, onions and peppers. drain grease. add soup. add mac & cheese and mix together. Place in a greased casserole dish and bake for 30 minutes at 350 degrees.