In a large saucepan heat oil over medium-high heat. Add onion and garlic; cook and stir 4 minutes or until onion is tender. Stir in broth and cornmeal. Bring to boiling, stirring constantly. Stir in next four ingredients (through chiles). Heat through. Stir in half of the cheese.
Top servings with remaining cheese and tortilla strips. If desired, serve with cilantro and/or sour cream.