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Add the butter to the Instant Pot and press Sauté. Once the butter has melted, add the mushrooms and sauté for 7 minutes, stirring occasionally, until the mushrooms have begun to caramelize and turn golden brown. Add the garlic, stir and sauté for 1 minute. Press Keep Warm/Cancel.
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Add the cream of mushroom soup, green beans, cream cheese, sour cream, parsley, lemon zest, salt, onion powder and black pepper to the Instant Pot, then stir until the cream cheese is incorporated.
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Place the lid on the Instant Pot, making sure the steam-release valve is sealed. Press the Manual button and set the Instant Pot for 5 minutes.
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When the Instant Pot beeps, press Keep Warm/Cancel. Using an oven mitt, “quick release” the steam-release valve. When the steam stops venting and the silver dial drops, carefully open the lid.
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Add the mozzarella cheese, cheddar cheese and Parmesan cheese and stir until they’re completely incorporated.