Melt the remaining 2 tablespoons butter in the pan. Add the shallots and a pinch of salt and saute for about 30 seconds, using a wooden spoon to scrape up any browned bits from the bottom of the pan. Add the mushrooms and saute until all of the mushroom liquid has evaporated and the mushrooms are golden, about 3 minutes. Season with 1/2 teaspoon salt, sprinkle with the flour
, and add the Marsala. Once the Marsala has almost completely evaporated, add the chicken
broth and reduce by half, about 3 minutes. Stir in the cream and parsley, return the pork and any accumulated juices to the pan, and cook, flipping the pork once, until it's firm to the touch and still a little pink in the middle (cut into a piece to check), 2 to 4 minutes. Taste for salt and pepper and serve.