olive oil • (14 1/2 ounces) reduced sodium chicken broth • chipotle chile in adobo, minced, plus 1 tablespoon sauce • garlic cloves, minced • Coarse salt and ground peppe • shredded cheddar cheese (6 ounces) • all-purpose flour • chili powder • onion, finely chopped • lean ground beef • corn tortillas (6-inch) • chopped cilantro