Meanwhile, heat oil in large nonstick skillet on medium-high heat. Add chicken; cook and stir 5 to 7 min. or until done. Stir in spinach and peppers; cook 2 min. or until spinach is wilted and peppers are crisp-tender. Add cream cheese product and milk; cook and stir 2 to 3 min. or until cream cheese is completely melted and sauce is heated through.