Chipotle Taco Soup

Name: Chipotle Taco Soup
Ingredients: 4 6-inch corn tortillas, cut into 1/2-inch-wide strips; 2 tablespoons olive oil; kosher salt and black pepper; 1 medium onion, chopped; 4 cloves garlic, chopped; 1 to 2 tablespoons chopped canned chipotle chilies in adobo sauce; 1/2 teaspoon ground cumin; 4 cups low-sodium chicken broth; 1 28-ounce can whole peeled tomatoes in puree; 6 boneless, skinless chicken thighs (1 3/4 pounds total); 1 tablespoon fresh lime juice; 2 ounces Cheddar, grated (about 1/2 cup); cut-up avocado, cilantro sprigs, and lime wedges for serving