Heat the olive oil over medium-high heat in a large skillet (needs to have a fitting lid). Add the onion and sauté for 2-3 minutes until just tender.Add the rice and stir, letting the rice toast slightly until it becomes a light brown. While it's toasting add the garlic salt and cumin and keep stirring.Add the can of Mexican diced tomatoes (including the juices) and the chicken broth, stir and bring mixture to a boil.Reduce heat to low, cover and let simmer for about 20 minutes.Fluff with fork, and enjoy!