Party Potatoes Au Gratin

Total Time

Prep: 25 min. Bake: 3 hours


16 servings

Updated: Oct. 14, 2022
Hearty helpings of these cheesy spuds will please hungry folks in a hurry. The rich, creamy sauce makes this recipe of my mother's the one folks request most. The potatoes are just as delicious the next day, reheat in the microwave with a little added milk.—Debbie Carlson, San Diego, California
Party Potatoes Au Gratin Recipe photo by Taste of Home


  • 1/2 cup butter, cubed
  • 1/3 cup all-purpose flour
  • 2 teaspoons salt, divided
  • 2 teaspoons pepper, divided
  • 4 cups whole milk
  • 7 large potatoes, peeled and thinly sliced
  • 2 medium onions, chopped
  • 8 cups shredded cheddar cheese


  1. In a large saucepan, melt butter. Stir in flour, 1 teaspoon salt and 1 teaspoon pepper until smooth. Gradually add milk; bring to a boil. Cook and stir for 2 minutes or until thickened and bubbly; set aside.
  2. Combine the potatoes, onions, cheese, remaining salt and pepper. Place a third of the mixture in a greased 5-qt. baking dish; top with a third of the sauce. Repeat layers twice.
  3. Cover and bake at 350° for 2-1/2 hours. Uncover; bake 30 minutes longer or until potatoes are tender.

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