Combine flour and 2 tablespoons fajita seasoning in a heavy-duty zip-top plastic bag; add chicken. Seal and shake to coat.
Cook chicken in hot oil in a large Dutch oven over high heat, stirring often, 4 minutes or until browned. Reduce heat to medium-high; add onion and garlic; sauté 5 minutes. Stir in remaining fajita seasoning, corn, next 5 ingredients, and, if desired, olives. Bring mixture to a boil; reduce heat to medium-low, cover and simmer 5 minutes. Remove lid, and stir in nacho cheese soup, chopped cilantro, and lime juice. Garnish, if desired, and serve with breadsticks, if desired.