This Chicken Tortilla Soup is a quick, vibrant meal built by sautéing onions and chilies before simmering them with chicken, broth, beans, and tomatoes. The entire dish comes together in under 30 minutes, making it ideal for a busy weeknight. Finish the soup with irresistible homemade corn tortilla strips, fresh avocado, and a cooling dollop of sour cream for the perfect texture and flavor contrast.