In a large pot over medium heat, heat the oil and brown the stew meat and the onions until onions are translucent; about 5 minutes
Pour in the diced tomatoes with chiles, beef broth and chile peppers. Stir in the garlic salt and cumin. Salt and pepper to taste.
Bring to a boil, reduce heat and simmer for 1 hour. Add a little more beef broth or water if needed during simmering.
Stir in cubed potatoes to the mixture and simmer for an additional 30 minutes or until potatoes are tender.
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