3 balsamic glazed chicken sandwich with peppers and Recipes

olive oil, divided, salt, divided, chicken breast tenders, balsamic vinegar, divided, red bell peppers , cut into strips (about 2 medium), onions, vertically sliced (about 1 large), focaccia bread (2 8oz loaves ), provolone cheese, thinly sliced, black pepper

olive oil, divided, salt, divided, chicken breast tenders, balsamic vinegar, divided, red bell pepper strips (about 2 medium), vertically sliced onion (about 1 large), loaves focaccia bread , cut in half horizontally, provolone cheese, thinly sliced, black pepper