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Instant Pot Garlic Parmesan Au Gratin Potatoes

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  • Author: 365 Days of Slow and Pressure Cooking
  • Prep Time: 20 minutes
  • Cook Time: 1 minute
  • Total Time: 21 minutes
  • Yield: 6 servings 1x


Thinly sliced potatoes with a creamy, white garlic and parmesan cheese sauce. 


  • 2 pounds Russet potatoes
  • 4 Tbsp butter
  • 1/4 cup diced onions
  • 1 Tbsp minced garlic
  • 2 Tbsp flour
  • 1 3/4 cup half and half
  • 1 tsp kosher salt
  • 1 tsp black pepper
  • 1 tsp garlic powder
  • 1 cup shredded parmesan cheese


  1. Pour 1 ½ cups water into bottom of Instant Pot. 
  2. Wash potatoes. If you want you can peel the potatoes. Slice potatoes very thinly with a mandoline or as best you can with a knife. Place the potatoes into a steamer basket*
  3. Place the steamer basket into the Instant Pot. Cover the Instant Pot and secure the lid. Make sure valve is set to sealing. Set the manual/pressure cook button to 1 minute. When time is up move valve to venting and remove the lid. 
  4. Remove the steamer basket out of the pot and set aside. Dump the water out of the Instant Pot liner and dry it out. Return the liner to the Instant Pot. 
  5. Turn Instant Pot to saute setting. Add in the butter and let it melt. Add in the onions and saute until soft and translucent. Add in the garlic and saute for about 30 seconds. 
  6. Stir in the flour a little at time. Whisk in the half and half, kosher salt, pepper and garlic powder. Cook on the saute setting until sauce has thickened. Turn off the Instant Pot. 
  7. Stir parmesan cheese into the sauce. Fold the potatoes into the sauce. 
  8. At this point you can serve and enjoy or you can bake using your air fryer lid to brown up the top. Bake for 5-10 minutes at 400 degrees (you can also do this in the oven, in a 9×9 inch baking dish). 
  • Category: Side
  • Method: Instant Pot/Air fryer lid