Harvest Shepherds Pie

Name: Harvest Shepherd's Pie
Ingredients: 4 ounces medium mushrooms, quartered; 3 carrots, cut into 1/2 pieces; 2 parsnips, cut into 1/2 pieces; 2 stalks celery, sliced; 1/2 butternut squash, peeled, seeded, and cubed; 1 sweet red pepper, cut into 1 pieces; 3 large shallots, cut into wedges; 2 teaspoons olive oil; 2 1/2 pounds sweet potatoes; salt; ground black pepper; 1 tablespoon cornstarch; 2 cups reduced-sodium vegetable broth; 1 teaspoon reduced-sodium soy sauce; 1 teaspoon dried Italian herb seasoning; 1/4 cup chopped fresh italian parsley