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Easy Instant Pot Cheesy Au Gratin Potatoes

  • Author: Rose Atwater


Instant Pot Au Gratin Potatoes are easy, cheesy and delicious! I absolutely love how much time is saved by making these cheesy potatoes in my Instant Pot!


  • 3 pounds potatoes, peeled and sliced evenly (about ¼ inch slices)
  • 1 cup water
  • 1 teaspoon salt, divided
  • ¼ teaspoon white or black pepper
  • 2 tablespoons butter
  • 1/4 cup flour
  • 1 cup milk
  • 2 ½ cups shredded sharp cheddar cheese, divided


  1. Mix together water and ½ teaspoon salt.
  2. To the electric pressure cooker, add the salt water and then sliced potatoes. Program the electric pressure cooker to cook on “manual” or “pressure cook” for 1 minute.
  3. Meanwhile, prepare the cheese sauce by melting the butter in a medium saucepan over medium heat. Stir in flour, remaining salt and pepper. Cook for 1 minute. Add milk all at once and continue stirring until the mixture comes to a boil. Mix in 2 cups of cheese and remove from heat. The sauce will continue to thicken as it rests.
  4. Preheat the oven broiler. Prepare a 9×9 square baking dish with nonstick cooking spray.
  5. When the electric pressure cooker cycle is complete, perform a quick pressure release. Carefully remove potatoes and layer with cheese sauce in baking dish.
  6. Cover the casserole with remaining cheese, if desired. Place under the broiler for 2 to 3 minutes or until the cheese has melted.