Roasted Garlic Vegetable Soup

Name: Roasted Garlic Vegetable Soup
Ingredients: 2 tablespoons olive oil; 1 large onion diced; 2 large carrot peeled and diced; 1 large leek white and light green part only, washed and diced; 1 rib celery, diced; 1 bunch thyme tied together with kitchen twine, plus 6 small sprigs for garnish; 2 bay leaves; 1 teaspoon coarse salt, or more to taste; ½ teaspoon freshly ground black pepper, or more to taste; 2 quarts chicken stock, preferably homemade; Roasted Garlic (recipe follows), cloves peeled; ¾ cup heavy cream; 6 very thin slices French bread, toasted and rubbed with a split garlic clove; 3 tablespoons grated Cotija cheese; 1 large head garlic (whole end unpeeled); 2 tablespoons extra virgin olive oil; ½ teaspoon dried oregano, crumbled; ½ teaspoon coarse salt; ½ teaspoon freshly ground black pepper