I made this recipe as written. Everyone who ate the potatoes thought they were great, but definitely garlicky. I think one head of garlic would have been sufficient. I was a bit concerned about the buttermilk because I'm not a huge fan of the tang, but it ended up being perfect. No need to add butter, but we did add a little bit of salt. I have already bookmarked this recipe and my husband has requested that we make it again soon.
Roasted Garlic Mashed Potatoes
From EatingWell: November/December 2013
In this healthy mashed potato recipe, we flavor the mashed potatoes with roasted garlic and tangy buttermilk. Try them alongside grilled steak or chicken.