For an even richer flavor, consider using roasted garlic instead of raw. Simply roast a head of garlic until soft and caramelized, then squeeze out a clove to add to the potatoes. Experiment with different herbs, such as chives, parsley, or sage, to customize the flavor profile. If you prefer a smoother consistency, you can use a potato ricer or pass the cooked potatoes through a food mill before mixing in the remaining ingredients. To keep the mashed potatoes warm before serving, place them in a heatproof bowl set over a pot of simmering water (a double boiler).