Cauliflower Cheddar Soup

Name: Cauliflower Cheddar Soup
Ingredients: 2 tablespoons butter; 2 cups sliced onion; 1 1/2 cups sliced celery (about 2 to 3 ribs ); 1/2 cup sliced carrot ( 1 small carrot ); 1 1/2 tablespoons minced garlic; 2 Yukon gold potatoes , peeled and thinly sliced, about 1 1/2 to 2 cups; 6 cups chicken stock; 6 cups roughly chopped cauliflower (see How to Cut and Core Cauliflower ); 2 bay leaves; 1 1/2 teaspoons fresh thyme leaves, or 1 teaspoon dried thyme; 1 teaspoon kosher salt; 1/8 teaspoon freshly ground black pepper; 1 1/2 cups grated sharp cheddar cheese (about 6 ounces ); 1 teaspoon Worcestershire sauce