Squash can be cooked ahead of time. Microwave squash and pull into strands as directed; place in large microwaveable bowl. Refrigerate up to 2 days. Discard both squash shells. When ready to serve, microwave squash, uncovered, on HIGH 3 to 5 min. or until heated through. Add remaining ingredients; toss lightly with fork. Microwave 2 min. or until heated through.