Position a rack in the upper third of the oven and preheat to 450 degrees F. Cook the broth, garlic, tomatoes and basil in a skillet over medium-high heat, stirring occasionally, until slightly thickened, about 15 minutes. Season with salt and pepper. Cover to keep warm.
Season the chicken with salt and pepper; place smooth-side down on a work surface.
Sprinkle with the parsley and mozzarella. Starting at the short end, roll up to enclose the filling. Secure with a toothpick.
Mix the parmesan and breadcrumbs in a shallow dish.
Put the egg white in another dish and beat until foamy.
Mist a cast-iron skillet with cooking spray. Dip the chicken rolls in the egg white, then coat with the breadcrumb mixture.
Place in the skillet, seam-side down.
Sprinkle with any remaining breadcrumbs and mist with cooking spray.
Bake until cooked through, about 20 minutes.
Serve with the tomato sauce, and polenta, if desired.