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Cast Away Casserole

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  • Author: 365 Days of Slow and Pressure Cooking
  • Prep Time: 25 minutes
  • Total Time: 25 minutes
  • Yield: 4-6 servings 1x


A small-ish batch of cheesy hashbrown potatoes made from scratch with the help of your Instant Pot. 


  • 1 1/2 pounds potatoes, peeled
  • 4 Tbsp butter
  • 1/2 cup finely diced onion
  • 1/4 cup flour
  • 1 cup water
  • 1 Tbsp Better than Bouillon chicken base
  • 1 cup milk
  • 1/4 tsp poultry seasoning
  • 1 tsp kosher salt
  • 1 tsp black pepper
  • 1 tsp garlic powder
  • 1/4 tsp smoked paprika
  • 1/4 cup sour cream
  • 1 cup cooked, chopped chicken (optional)
  • 3/4 cup shredded sharp cheddar cheese


  1. Pour 1 ½ cups water into bottom of Instant Pot. Place a trivet in the pot. Place the potatoes on top of the trivet. 
  2. Cover Instant Pot and secure the lid. Make sure valve is set to sealing. Set the manual/pressure cook button to 12 minutes for small potatoes, 15 minutes for medium potatoes or 20 minutes for large potatoes. When time is up move valve to venting and remove the lid.
  3. Move potatoes out of the pot and let them cool. (If you’d like you can do this step a day before and leave potatoes in the refrigerator until ready to cook the rest of the dish). Shred the potatoes after they are cool.
  4. Discard water in Instant Pot and dry out the pot. Turn Instant Pot to saute setting. When display says HOT add in the butter and let it melt. Add in the onion and saute for 5 minutes. 
  5. Slowly whisk in the flour, a tablespoon at a time. Then slowly whisk in the water, Better than Bouillon and milk. Let cook and bubble until thickened. 
  6. Turn off Instant Pot. Stir in the poultry seasoning, salt, pepper, garlic powder, paprika, sour cream, chicken and a half cup of the cheese. Fold in the potatoes. 
  7. If you have an air fryer lid: Cover Instant Pot with air fryer lid and bake at 300 degrees for 10 minutes. Sprinkle the cheese on top and air fry at 400 degrees for 3-5 more minutes, until cheese starts to brown. If you don’t have an air fryer lid: Scrape the mixture into a greased 9×9 inch baking dish, sprinkle the remaining cheese on top and bake at 375 degrees for 25 minutes. 
  8. Serve and enjoy! 
  • Category: Side
  • Method: Instant Pot/Air fryer lid