In a large mixing bowl, combine the ground chuck with eggs, Parmesan cheese, Worcestershire sauce, salt, and pepper.  Use your hands to mix everything gently. You want the ingredients to blend nicely but don't overwork the meat; we want it tender!

In a skillet over medium heat, cook the bacon until crisp. Once ready, drain the bacon on paper towels to absorb the excess fat.  Reserve some of the drippings in the pan; this will add even more flavor to the cheesesteak.

Add the meat mixture to the skillet with the reserved bacon drippings. Cook it over medium heat, breaking it apart with a spatula.  You'll know it's ready when it’s brown and no longer pink. Stir in the crispy bacon bits toward the end.

Pour in the beef stock. This will help keep everything moist and add that rich flavor! Let the mixture simmer for a few minutes, absorbing the stock nicely.

Take your slices of white sandwich bread and top each slice generously with the meat mixture. Add a slice of cheddar cheese on top. Finally, close the sandwich with another slice of bread.

In a clean skillet over medium heat, grill each sandwich for about 2-3 minutes on each side until golden brown and the cheese has melted. You can press down lightly to make them crispy and golden.