Preheat oven to 350 degrees. Place egg white and garlic in one small bowl. Beat together. In another small bowl add bread crumbs. First place chicken breast in bowl with egg and garlic, then, in bowl with crumbs. Spray cookie sheet and place chicken breasts on sheet. Add basil and tomatoes on top of chicken. Drizzle balsamic vinegar on top of chicken. Cook for 20 minutes or until chicken is no longer pink inside.