Shiitake-Topped Mashed Potatoes
Prepare mushroom gravy as directed; cool. Transfer to an airtight container and chill for up to 12 hours. To reheat, transfer to a medium saucepan. Cover and cook until heated through, adding additional broth or Madeira to thin the gravy, if necessary. Serve over mashed potatoes. Prepare mashed potatoes as directed. Spoon potatoes into an ovenproof bowl, cover, and keep warm in a 300 degrees F oven for up to 30 minutes. Stir in a little milk if potatoes become too stiff.