Oh my goodness this sounds absolutely delicious! Thank you for sharing this recipe, I think I have most of the ingredients and may have to give this a try today, as we just got our first snowfall.
I love the idea of using pineapple specifically in the chili. A friend of mine got me hooked on including pineapple in my baked beans (along with bacon) many years ago, but I can't believe we never though to put them in a chili as well.
I agree, 12 chicken breasts sounds wayyyy excessive. The chicken breasts at our chain grocery stores are so freakishly huge, you could literally feed four people with just one of them. I wouldn't even remotely be able to fit twelve of those in even my largest stock pot. On the other hand, if you are able to buy chicken directly from a local butcher or farmers market, they will often sell more realistic size chicken breasts which are around 6-8oz. Even then, 12 sounds like an awful lot.
I'm assuming the pineapple doesn't hold up well though in terms of heating and storing the chili - so that would be one thing I would need to take into consideration if I wanted to make batches of this as freezer meals.