Combine the tomatoes and 2 tablespoons Maple-Balsamic Dressing; toss well to coat. Arrange tomatoes, cut sides up, on a jelly-roll pan coated with cooking spray. Bake at 350° for 30 minutes or until tomatoes soften. Cool completely.
Combine tomatoes, baby arugula, and onion in a large bowl. Drizzle with the remaining 2 tablespoons Maple-Balsamic Dressing; toss gently to coat. Sprinkle evenly with cheese and pepper.
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