Casseroles, they can be good, bad, sort of mediocre… but this casserole is different. This is the kind of insanely yummy comfort food you will want to serve to guests. Scratch that. You will want to invite guests over just so you can impress them with your creamy poppy seed chicken casserole that your Chef created just for you. Seriously, this dish is that good. Good enough that we can make an extra large casserole dish so that you can guarantee yourself some leftovers for lunch tomorrow. And that, is probably a really genius idea.