Cut the fat off your chicken, then butterfly each breast in half. This will prevent the chicken from being too thick.
Create a rub for the chicken. Eyeing each spice, mix together parsley, basil, oregano, thyme, salt, and pepper in a bowl. Then add some olive oil to create a "paste." Put the rub on each piece of chicken until they are covered and spiced to your liking. Set the chicken aside in the fridge.
Preheat grill on medium-high heat.
Meanwhile, make the bruschetta. Dice the tomatoes and onion, then mince the basil. Mix the three ingredients in a bowl, then add some of your favorite olive oil. I eye the amount of each ingredient, but try to make the tomatoes, onion, and basil a 1:1:1 ratio.
Once the grill is preheated and the bruschetta is made, grill the chicken. This typically takes about 10 minutes. Once the chicken is done, put each burner on low heat, and add the sliced mozzarella. Let grill for about 2 minutes or until the cheese is fully melted.
Next, spoon bruschetta on each slice of chicken. Add as little or as much as you want. I typically like to put enough on to cover the cheese. Enjoy!