In a large pot over medium-high heat, combine the broth with the chicken, onion, tomatoes, red pepper flakes, and salt to taste. Bring to a simmer.

While soup is heating, heat the oil in a medium skillet over medium-high heat.

Cut the tortillas into thin strips and fry them in batches until they are golden brown. Drain on paper towels or a paper bag and season with salt. When the soup is hot, taste and adjust the seasoning. Serve it in bowls topped with the tortilla strips, chopped cilantro, and lime wedges.

Serving Yield: 4