BRUSH fish with 2 Tbsp. dressing; cook in skillet on medium heat 3 to 4 min. on each side or until fish flakes easily with fork. Transfer to plate; cover to keep warm.

ADD remaining dressing, vegetables and tomatoes to skillet; cook 5 min. or until peppers are crisp-tender and vegetables are heated through, stirring frequently. Spoon over fish.

TOP with basil.