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Export 13 ingredients for grocery delivery
Cut each chicken breast apart horizontally into 2 thinner pieces. Season with salt and pepper.
Turn Instant Pot on "Saute" mode. When hot, add butter and olive oil. When butter has melted, add garlic and onion and cook for 2 minutes. Turn Instant pot off.
Add chicken, chicken broth. lemon juice, lemon zest, Italian seasoning, red pepper flakes, and salt.
Place lid on Instant Pot. Make sure valve is in sealing position. Pressure Cook on HIGH for 8 minutes. Do a quick pressure release. When the pin drops, remove the lid.
Remove chicken and set aside. Turn the Instant pot to "Saute" mode and simmer the liquid for 5 minutes to reduce it.
Add cream. Mix cornstarch with 1 1/2 teaspoons water and mix into the liquid. Simmer for 2 minutes.
Turn Instant Pot off and stir in cheese until melted. To serve, spoon sauce over chicken.