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potatoes au gratin served in a square white casserole dish
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3.84 from 6 votes

Potatoes Au Gratin

This easy potatoes au gratin recipe layers thinly sliced potatoes with a rich, creamy cheese sauce. So good!
Course: Side Dish
Cuisine: American
Keyword: cheesy potatoes, potato dish, potato recipes, potatoes, potatoes au gratin
Author: Kasey Schwartz


  • 4 cups thinly sliced russet potatoes
  • 3 tbsp butter
  • 3 tbsp flour
  • 1 1/2 cups heavy cream
  • 1 1/2 cups gruyere cheese divided
  • 1 tsp salt + pepper
  • 1 tsp dry mustard


  • Preheat the oven to 350 degrees.
  • In a small sauce pan, melt butter. Once melted add flour with a fork – whisking together.
  • Next, whisk in milk.
  • Cook sauce on low until smooth and boiling, whisking until thickened.
  • Add in salt, pepper , and dry mustard and stir well.
  • Reduce heat to low and stir in 1 cup of the cheese.
  • Place a half of the sliced potatoes in a lightly greased 1.5 quart casserole dish (8×8 or 9×9 will work)
  • Pour half of the cheese sauce over potatoes.
  • Add a second layer of potatoes and the rest of the cheese sauce to the top of that layer
  • Sprinkle the remaining 1/2 cup of cheese on top.
  • Sprinkle the top with paprika.
  • Bake at 350 degrees, uncovered for 1 hour.