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Season chicken with salt and pepper. If necessary slice into thinner pieces or tenderize it.
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Set the Instant Pot to saute mode and add the olive oil and butter.
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Add the chicken to the pot and sear on each side for 2-3 minutes until golden. Remove and set aside.
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Next, add minced garlic to the pot and sauté for 30 seconds until fragrant. Pour in the chicken broth, scraping up any browned bits from the bottom (this prevents a burn warning).
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Stir in heavy cream, sun-dried tomatoes, Italian seasoning, and red pepper flakes (if using).
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Return the chicken to the Instant Pot, ensuring it's coated in the sauce.
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Close the lid, set the valve to Sealing, and cook on High Pressure for 7 minutes (8-10 minutes for thicker chicken breasts).
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Allow the pressure to naturally release for 5 minutes, then do a quick release.
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Thicken the sauce: once complete, remove the chicken and set aside.
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Set the Instant Pot to Sauté mode and simmer the sauce for a few minutes to thicken. Optional: You can stir in a cornstarch slurry (1 teaspoon cornstarch mixed with 1 tablespoon water) for a thicker sauce.
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Lastly, stir in the spinach and Parmesan cheese.
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Return the chicken to the sauce or serve it on a plate with the sauce poured over. Garnish with fresh basil and serve with pasta, rice, or mashed potatoes.
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Marry me chicken lasts 3-4 days in the fridge in an airtight container.