I've made this recipe several times since my initial review two years ago. As I was printing off the recipe for this Christmas prep, I read some of the more recent comments, and decided to add what I've learned in the past couple years: there's a big difference between doing it the day before vs the same day. When made the day before, it's stiffer and the sour cream and garlic (if you add that, as I do) are twice as strong. Much too strong, in my opinion. And you will need to re-mash with milk and butter to fluff it up, which means you lose half the benefit of doing it ahead of time.
I HIGHLY recommend doing it only a few hours before (3 or 4 has been just right, for me) and then putting it in a slow cooker on low until dinner. The flavor is prefect and it's still fluffy.
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