Heat oven to 350°F. In 10-inch skillet, heat oil over medium-high heat. Add chicken; cook about 4 minutes, stirring frequently, until no longer pink in center. Add onion; cook until crisp-tender. Stir in mixed vegetables. In medium bowl, mix sour cream, gravy, cornstarch, thyme and pepper until blended. Stir into chicken mixture; cook until hot. Spoon into ungreased 13x9-inch baking dish. Separate dough into 10 biscuits; arrange over chicken mixture. Sprinkle with cheese. Bake 15 to 18 minutes or until filling is bubbly and biscuits are golden brown. Garnish with bacon and chives.