Freezer Garlic Mashed Potatoes November 23, 2016 by Cynthia Ewer A little-known trick to calm holiday cooking stress? Make-ahead dishes for the freezer. Cooked and stored ahead of time, freezer side dishes free up time for the holiday cook. But can you get perfect creamy texture ... from frozen potatoes? Potatoes look watery before freezing, but the water will be absorbed as they bake. While it is possible to substitute russet potatoes, Yukon Gold potatoes yield a more flavorful dish. A Ewer family favorite!