Grilled Summer Vegetable Hasselback Chicken

Ingredients

• 4 boneless, skinless chicken breasts (about 6oz each)
• ½ small red bell pepper, thinly sliced
• ¼ medium yellow squash, halved lengthwise and thinly sliced
• ¼ medium zucchini, halved lengthwise and thinly sliced
• ¼ small red onion, thinly sliced
• 2 tbsp olive oil
• ½ cup shredded low-moisture, part-skim mozzarella cheese
• 2 tbsp chopped fresh basil