In a large bowl, combine all the bruschetta ingredients. Set aside.
Season the chicken with salt and pepper. In a large skillet over medium-high heat, heat the olive oil. Add the chicken and sear 2 to 3 minutes on each side, or until cooked through.
Toast or heat the buns, then garnish each one with mayo (if desired), sliced Provolone cheese, baby spinach, seared chicken, and orange bruschetta.