2 eggs
1/3 cup (2 1/2 ounces) sugar
1 1/2 teaspoons salt
6 tablespoons (3 ounces) butter
1 cup (7 1/4 ounces) unseasoned mashed potatoes, lightly packed*
2 1/2 teaspoons instant yeast
3/4 cup water (potato water, if possible)
4 1/4 cups (18 ounces) King Arthur Unbleached All-Purpose Flour

*1 medium-to-large baking potato will yield 8 ounces of mashed potato.