Easy Cream of Celery Soup

Ingredients

• 3 tablespoons butter
• 1 pound celery ribs, chopped (about 3 cups)
• 1 medium onion, chopped
• 2 garlic cloves, minced
• 1-1/4 teaspoons salt
• 1 teaspoon celery seed, crushed
• 1/2 teaspoon pepper
• 5 tablespoons all-purpose flour
• 4 cups reduced-sodium chicken broth
• 1/2 cup heavy whipping cream
• 1 tablespoon sherry, optional