Both pommes Anna and potatoes au gratin feature thinly sliced potatoes baked into a cake. Does that mean that they're simply ...

When put together, you can create everything from silky mashed potatoes to disco fries ... tubers and unctuous dairy -- scalloped potatoes, and au gratin. Given that these dishes have so much ...

While mashed potatoes are always best made at the last minute, you can turn this into an easy make-ahead mash, reformulating it as a gratin.