Slow Cooker Sweet Potato Soup - Litchfield Farmers' Market

Ingredients

• 3 pounds sweet potatoes, peeled and cut into 1-inch cubes (about 8 cups)
• 2 tablespoons butter
• 1 tablespoon Worcestershire sauce
• 1 medium onion chopped (or 1 teaspoon dried minced onion)
• 2 ribs celery chopped (or 1 teaspoon dried celery flakes)
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• ¾ teaspoons minced fresh thyme (or 1/4 teaspoon dried thyme)
• 1/8 teaspoon ground chipotle pepper (optional)
• 6 cups reduced-sodium chicken broth