Preheat grill over high heat. Top the hot charcoal with 2 wine barrel staves (or if you use an indoor grill pan or decide not to grill see Cook's Note below). Grill each chicken breast about 4 to 6 minutes on each side (depends on how thick the breast is). The chicken should be solid white throughout. This step obviously involves John doing most of the work.

Remove chicken from the grill. Top each breast with divided portions of the mozzarella cheese, diced tomatoes and roasted bell peppers, and then basil.

Drizzle balsamic glaze on each portion.