Grilled Chicken Ratatouille

Name: Grilled Chicken Ratatouille
Ingredients: 1 chopped fresh marjoram; 3 tablespoons extra-virgin olive oil; 1 red bell pepper, halved lengthwise, stemmed and seeded; 1/4 teaspoon freshly ground pepper; 1 medium red onion, cut into 1/2-inch-thick rounds; 1 medium zucchini, halved lengthwise; 3 tablespoons chopped fresh basil; Canola or olive oil cooking spray; 1 small eggplant, cut into 1/2-inch-thick rounds; 4 plum tomatoes, halved lengthwise; 1 teaspoon salt; 1 tablespoon red-wine vinegar; 4 boneless, skinless chicken breasts, (about 1 1/4 pounds), trimmed and tenders removed (see Note)