In bowl, beat egg and Cooking Cream with fork, Balsamic Vinegar, Worcestershire, fresh Parsley, mix in bread crumbs, onion, mustard, salt, and pepper.
Mix in beef.
Shape into four 1 cm thick patties. (Make-ahead: Cover and refrigerate for up to 6 hours.
Place patties on greased grill over medium-high heat; close lid and cook, turning patties once, for about 10 minutes or until no longer pink inside.
Place in hamburger buns topped with Provolone Cheese.
Serve with baked truffle potato./p>