Sprinkle both sides of the chicken breasts with the Italian seasoning, garlic powder, salt, and pepper. Grill chicken on a grill or grill pan sprayed with cooking spray for 5-7 minutes on each side, or until fully cooked and juices are clear. Top each chicken breast with one slice of provolone cheese and allow cheese to melt.
Meanwhile, in a medium bowl, combine the fresh tomato/basil ingredients.
Top each chicken breast with 1/2 cup fresh tomato/basil mixture.