HEAT oil in large skillet on medium-high heat. Add chicken; cook 8 min. or until chicken is cooked through, stirring occasionally.
ADD broccoli; cook and stir 5 min. or until heated through.
STIR in Velveeta and milk. Reduce heat to low; cook 3 min. or until Velveeta is completely melted, stirring frequently. Spoon over the potatoes.
serving size = 1 stuffed potato