Classic Butternut Squash Soup

Name: Classic Butternut Squash Soup
Ingredients: 3 tablespoons olive oil; 1 large leek, thickly sliced; 1 medium carrot, chopped; 1 medium white sweet potato (about 1/2 lb), peeled and chopped; 1 tart apple, peeled, cored, and chopped; 2-3 sprigs fresh thyme; 1/2 teaspoon ground ginger; 1/2 teaspoon ground cinnamon OR 1 3-inch cinnamon stick; 1 1/2 pounds butternut squash (about 1 medium squash), peeled, seeded, and cubed; 1 bay leaf; 1 quart vegetable broth or water; 1 1/2 ounces (1 shot) brandy or bourbon (optional); Salt and freshly ground black pepper to taste