In 4-quart Dutch oven, heat oil over medium-high heat. Cook onions and poblano chiles in oil 5 to 7 minutes, stirring occasionally, until tender. Add garlic and jalapeño chile; cook and stir 1 minute. Stir in broth, potatoes, ancho chile pepper and salt. Heat to boiling; reduce heat to medium-low. Cover; cook 15 to 17 minutes or until potatoes are tender.