Add Italian seasoning, red pepper flakes, minced garlic and chicken stock to your Instant Pot and whisk together.
Place the chicken breasts in the Instant Pot, turning them to evenly coat both sides in the stock mixture.
Secure the lid on your Instant Pot and make sure the sealing valve is set to “Sealing.” Cook on high pressure for 12 minutes. When the time is up, carefully perform a quick release by turning the valve to “Venting.”
Remove chicken and set aside.
Switch your Instant Pot to Sauté mode and let it heat for about 2 minutes. Then, stir in the remaining ingredients—heavy cream, lemon juice, and Parmesan cheese.
Allow the sauce to reduce and simmer for about seven minutes.
Plate the chicken and generously spoon the creamy lemon sauce over each piece—use as much or as little as you like. Enjoy!