In same skillet, heat remaining 1 tablespoon oil. Add chicken; cook 5 to 7 minutes, stirring occasionally, until no longer pink. Stir in potatoes and tomatoes; cook 2 to 3 minutes longer or until thoroughly heated. Sprinkle evenly with bacon pieces, 3 tablespoon of the onions and the cheese. Reduce heat to low; cover and cook 5 to 6 minutes longer or until cheese is melted.