Ingredients

• 5 boneless, skinless chicken breast halves (about 6 oz. each)
• Olive oil for brushing
• Kosher salt and freshly ground black pepper
• 1 yellow bell pepper, cored, seeded, and very thinly sliced
• 1/2 green bell pepper, cored, seeded, and very thinly sliced
• 1 poblano chile or other hot green chile, cored, seeded, and very thinly sliced
• 1/2 to 1 jalapeño, cored, seeded, and finely chopped
• 1/2 small red onion, thinly sliced
• 1/4 cup red-wine vinegar
• 1 Tbs. balsamic vinegar
• 2 cloves garlic, finely chopped
• 1/2 tsp. crushed red pepper flakes
• 1/4 cup extra-virgin olive oil
• 20 red cherry tomatoes, halved
• 20 yellow cherry tomatoes, halved
• 3/4 cup Niçoise, Kalamata, or other good-quality black olives, pitted
• 30 basil leaves, washed, dried, and torn into small pieces