Chicken Caprese Pesto Panini {No Press Required}

Ingredients

• 1 tablespoon olive oil
• 4 (4-ounce) chicken cutlets ( pounded to ¼-inch thick)
• Salt and pepper
• ½ cup pesto
• 8 slices sourdough bread
• 2 ripe tomatoes (cut into ¼-inch slices)
• 8 ounces fresh mozzarella (cut into ¼-inch slices)
• 12-16 fresh basil leaves (optional)