RESERVE 1 Tbsp. dressing; brush remaining dressing onto both sides of bread slices.

COOK in large nonstick skillet on medium-high heat 2 to 3 min. or until bottoms are golden brown; turn. Cook 1 min. to brown other sides.

TOP with cheese and tomatoes; brush with remaining dressing. Cook 1 to 2 min. or until cheese is melted.