1. Preheat oven to 400°. Place butter in a 13- x 9-inch baking dish; bake 5 minutes or until melted. Stir in broth and next 3 ingredients.
2. Bake, covered, at 400° for 35 minutes. Remove from oven. Fluff rice with a fork. Stir in chicken, mozzarella, and tomatoes; sprinkle with shredded basil. Serve immediately.