Preheat oven to 425°F.
Using a meat tenderizer, pound the six pieces of chicken to equal thickness. Sprinkle chicken liberally on both sides with Greek Girls Gourmet All Purpose Greek Seasoning.
Place a large cast iron skillet over medium high heat and add olive oil. Sear chicken on both sides until well browned.
Remove chicken from pan and set aside. Add to the skillet one can of fire roasted tomatoes and stir to deglaze.
Add chicken back to the pan and top each piece with ½ tablespoon of pesto, spreading to cover each piece.
Place skillet into preheated oven for 15-20 minutes, until chicken reaches internal temperature of 165°F.
Remove skillet from the oven and top each piece of chicken with a slice of mozzarella.
Preheat broiler. Place skillet under broiler for several minutes until cheese is melted.
Remove skillet from oven and drizzle with balsamic vinegar.
