I made a chicken in the crockpot this weekend...
Stuffed the cavity with a whole head of garlic (peeled and each clove cut in half) and a coarsley chopped onion, and S&P...
with a small can of chicken broth... That was it...
The garlic comes out sweet after cooking...

Just like in "Chicken with 40 Cloves of Garlic"... (that's about 3-4 large heads)...
I've made this version in the past... good recipe...
and no "garlic" breath after you eat it...
http://www.foodnetwork.com/recipes/ina-garten/chicken-with-forty-cloves-of-garlic-recipe/index.html