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Preheat oven to 400 degrees F. Line a baking sheet with heavy-duty foil.
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Place the chicken and pesto in medium bowl; toss to coat.
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Place the chicken on the prepared baking sheet. Bake for 20-25 minutes or until chicken is no longer pink in the center.
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Remove from the oven; top with tomatoes and cheese.
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Bake for an additional 3-5 minutes or until cheese is melted.