In a large saucepan, combine broth, rice, undrained chiles, onion, butter and salt. Bring to a boil over high heat. Stir, then reduce heat to low. Cover and simmer until rice is tender (about 20-25 minutes). Remove from heat, fluff with a fork and serve.
Notes
Finish with a spritz or two of lime for even more flavor when serving this with your favorite Mexican dishes.