Easy Instant Pot Chicken Marsala

skinless (boneless, chicken breasts)

all-purpose flour (,for dredging)

Kosher salt and freshly ground black pepper

garlic powder

butter

olive oil

mushrooms (,stemmed and halved)

shallot (,thinly sliced)

garlic (,minced)

Marsala wine

chicken stock

heavy cream

Parsley to garnish