1. In a large saucepan, heat oil over medium-high. Add chicken & taco seasoning. Cook 5-7 minutes or until chicken is browned on all sides, stirring throughout. Stir in corn & peppers. Sauté another 2-3 minutes.
2. Add broth & potatoes. Bring to a boil & simmer, uncovered, 10-15 minutes, stirring occasionally, until chicken is cooked through & potatoes are fork-tender.
3. In a small bowl, mix together milk & cornstarch. Stir mixture into saucepan. Let simmer 2-3 minutes or until it thickens.
4. Serve topped with cilantro.