boneless, skinless chicken breasts (about 1 1/2 lb. total)
all-purpose flour
garlic powder
freshly ground black pepper
kosher salt, divided
extra-virgin olive oil
unsalted butter
head garlic, cloves separated, peeled, lightly smashed (about 14 cloves)
dry white wine
low-sodium chicken stock
heavy cream
Parmesan, finely grated (about 1/2 c.)
Chopped fresh parsley, for serving