Individual Mushroom Potpies with Parker House Crust

Name: Individual Mushroom Potpies with Parker House Crust
Ingredients: 1 large baking potato, cut into 1/2-inch dice; One 1 1/2-pound butternut squash, neck only, cut into 3/4-inch dice (about 2 cups); 1 cup frozen pearl onions, thawed; 2 carrots, thinly sliced; 1 stick unsalted butter, melted; Salt; Freshly ground pepper; 1 large onion, diced; 1 tablespoon chopped sage; 1 teaspoon chopped thyme; 1 teaspoon chopped rosemary; 1 1/2 pounds mixed mushrooms, such as shiitake and cremini, stemmed and thinly sliced (8 cups); 1/2 cup Marsala; 1/2 cup all-purpose flour; 6 cups Rich Mushroom Stock or vegetable stock; Parker House Roll Dough