Pound chicken: Lightly pound the chicken breasts. This will help prevent the chicken from curling while sautéing and also keep the meat extremely tender & juicy.
Season & Dredge Chicken: Season the chicken breasts with sprinkles of paprika, crushed black pepper & salt both sides. Rub them well. Than, dredge the chicken breasts with flour on all sides. Lightly dust off the excess flour & place them on a plate.
Sear dredged Chicken: Set the Instant Pot on SAUTE function & set it on HIGH heat. Add oil & butter, allow them to become hot. Than, gently release the dredged chicken cutlets & sear them until golden on both sides. Set the seared cutlets aside.
Saute aromatics: There'll be lots of brown bits stuck at the bottom of the pot, do not worry, we'll be de-glaze the pot very well. Now, in the same pot add onion or shallots & garlic & saute until they turn soft. Add salt to quicken the process.
De-glaze pot: Pour Marsala wine and de-glaze the pot very well scrapping the sides & the bottom of the pot with spatula. There should not be any food particles stuck at the bottom of the pot. This will prevent the burn and also help cook off the alcohol. Add the chicken stock and stir to mix well. CANCEL the SAUTE function.
Pressure cook: Now, add the sliced mushrooms, spread them gently to form a single layer. DO NOT stir or mix. Place the chicken cutlets on the bed of mushrooms. DO NOT stir or mix. Secure the lid, seal the valve and PRESSURE COOK on HIGH for 4 mins. Once the cooking cycle is over the instant pot will begin to beep. Wait for 5 mins natural pressure release & than release the rest of the pressure manually by moving the valve from the sealing to the venting position. Open the lid carefully.
Prepare creamy Marsala sauce: Fish out the cooked chicken cutlets & set them aside. Slightly warm up the heavy cream in the microwave oven, add the cornstarch & stir to mix well. Now, add it to the rest of the ingredients in the pot. Mix well. Hit the SAUTE function & set it on LOW heat. Simmer the sauce stirring frequently until it thickens to your desired consistency. It should be pourable.
Serve creamy Chicken Marsala: Turn off the instant pot & transfer back the cooked chicken cutlets into the pot. Smother them with the Marsala sauce and allow them to rest for 5 mins in the sauce. This will help them soak up the amazing creamy flavor! Serve immediately and enjoy!