HEAT oven to 375ºF.
ADD seasoning mix to chicken in medium bowl; toss to evenly coat.
HEAT dressing in large skillet on medium-high heat. Add chicken; cook and stir 5 min. or until lightly browned. Spoon into 1-1/2-qt. casserole; cover with layers of beans, corn, onions and salsa.
BAKE 20 min. Top with cheese; bake 5 min. or until melted. Serve over rice.