Saute onion, carrots,celery and bacon in 2 Tbsp. butter until the onions are transparent and vegetables are cooked.Add broccoli, 3/4 cup hazlenuts and cream cheese.saute until blended. Line inside of each chicken breast with slice of ham. Spoon mixture into center of ham and fold meat over. Lay breast with the fold underneath in a gless baking dish.Combine chicken stock and wine . Pour over the chicken,cover and bake for 1 hour at 350. Remove the liquid, strain and reserve. Melt remaing 2 Tbsp. butter and mix in flour. Add cream and 1 cup reserved liquid. Whisk constantly until thickened. Do not boil. Place chicken breasts on serving platter and pour sauce over them Sprinkle with remaining hazelnuts and parsley.