4 Tbsp olive oil
8-10 boneless, skinless, split chicken breasts halves (about 3.5 lbs total of chicken)
ground black pepper and sea salt, to taste
2 medium onions, thinly sliced
2 Tbsp of salt-free “Italian seasonings” (or 2 tsp each: dried oregano,basil, and rosemary and 1 tsp dried thyme)
6-8 garlic cloves
3/4 cup balsamic vinegar
2 14.5 oz cans diced or crushed tomatoes
1/2 cup black or green pitted olives, drained and coarsely chopped
2-3 Tbsp capers, drained