1 lb. Pappardelle’s Porcini Mushroom Linguine
1 lb. boneless/skinless chicken breasts, cut into 3/4-inch pieces
1 lb. fresh shiitake mushrooms, stems removed and cut into 1/2-inch strips
3 tablespoons butter
1 tablespoon olive oil
1/2 onion, finely chopped
1 cup heavy cream or half-and-half
4 oz. Gorgonzola cheese
Freshly grated Parmesan cheese and Italian flat-leaf parsley (For garnish, if desired)