In a 3 quart saucepan, heat up the oil on medium heat. Once hot, add the onions and cumin and stir until onions have softened. Add the tomatoes and chiles, continuously stirring until the liquid begins to evaporate. Stir in the rice and mix well so that all rice is covered with the tomato, pepper & onions mixture. Continue stirring for about 2 minutes. Add chicken broth and turn heat to high. Once it comes to a boil, cover pan and bring down heat to a low simmer. Cook on low for 17-20 minutes or until fluffy.