HEAT barbecue to medium-high heat.
PLACE tomatoes, cut sides up, in 8-inch square foil pan sprayed with cooking spray. Drizzle with dressing; top with cheeses. Place pan on barbecue grate.
GRILL 10 to 12 min. or until mozzarella is melted and tomatoes are heated through.
SPRINKLE with basil.
serving size = 2 topped tomatoes halves (128 g)