Peel potatoes, and cut into quarters. Place in a medium saucepan. Cover with cold water, and bring to a simmer. Keep potatoes at a low simmer until a skewer slips in and out easily, about 20 minutes. Drain potatoes in a colander. Allow potatoes to sit until cool enough to handle.
Put potatoes through a ricer, or place in a large mixing bowl, and mash using a potato masher. Beat in butter, cream, sugar, and salt. Refrigerate overnight, uncovered.
The next day, add flour. Stir until well blended. Divide into 20 equal portions. Heat lefse griddle, electric fry pan, or pancake griddle to 400 degrees F.
On a floured surface, roll out the balls of dough until very thin, making circles about 10 to 12 inches in diameter. Using a long, thin spatula, transfer to the heated griddle and cook on each side. Stack between 2 terrycloth towels, and cover with a plastic bag.
To serve, spread lefse with soft butter, and fold into quarters or roll up. To serve on a tray along with cookies, spread lefse with butter, sprinkle with cinnamon and sugar, and roll up. Cut rolls on the diagonal into 1-inch pieces.
To freeze, fold lefse into quarters, and wrap until airtight in foil or plastic wrap. To serve, remove from freezer, thaw, and reheat in foil in a preheated 300 degree F oven, 10 to 15 minutes.
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