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Instant Pot green bean casserole

Instant Pot Green Bean Casserole

  • Author: Sonja Overhiser
  • Prep Time: 15 minutes
  • Cook Time: 15 minutes
  • Total Time: 30 minutes
  • Yield: 8 1x


Here’s an Instant Pot green bean casserole from scratch: fresh green beans, real mushrooms, and a crumbled potato chip topping! 


  • 8 ounces baby bella mushrooms*
  • 1 large shallot
  • 2 pounds green beans
  • 1 tablespoon olive oil
  • 2 teaspoons cornstarch
  • 1/2 cup heavy cream
  • 1/2 cup grated Parmesan cheese
  • 1 garlic clove, grated
  • 1 teaspoon ground dried thyme
  • 1/2 teaspoon dried sage
  • 1/2 teaspoon garlic powder
  • 1 teaspoon kosher salt, plus more to taste
  • Fresh ground black pepper
  • 1/2 cup gourmet potato chips, sour cream and onion flavor**


  1. Finely chop the mushrooms. Mince the shallot. Trim the green beans.
  2. Turn on Saute mode and add the olive oil to the Instant Pot. When it is heated, add the mushroom and shallot and saute for 6 minutes until tender. Then add green beans and 1/2 cup water. Lock the lid of the Instant Pot. Place the pressure release handle (vent) in the “Sealing” position.
  3. Cook on High Pressure for 1 minute: Press the Pressure Cook button, making sure the “High Pressure” setting is selected, and set the time. Note that it takes about 5 minutes for the pot to “preheat” and come up to pressure before it starts cooking. (During cooking, avoid touching the metal part of the lid.)
  4. Quick release: Vent the remaining steam from the Instant Pot by moving the pressure release handle to “Venting”, covering your hand with a towel or hot pad. Never put your hands or face near the vent when releasing steam. Open the pressure cooker lid.
  5. Stir in cornstarch until coated. Add the cream, Parmesan cheese, grated garlic, thyme, sage, garlic powder, and kosher salt. Turn on Saute mode again and cook 1 minute until thickened and bubbly. Taste and add more salt as desired.
  6. Remove the bean mixture to a serving dish, 9 x 9 baking dish or medium casserole dish. Serve topped with crushed potato chips.


*This quantity makes enough for a 9 x 9 size baking dish or casserole dish equivalent. If you’d like a larger amount for Thanksgiving or to feed a huge crowd, you can double and fit into a 9 x 13 size baking dish.

**Of course if you must, feel free to substitute the traditional french fried onions! We won’t judge.

  • Category: Side Dish
  • Method: Pressure Cooker
  • Cuisine: Holiday

Keywords: Instant Pot Green Bean Casserole