For the meatloaf: Preheat the oven to 350 degrees F.
Pour the milk over the bread and allow it to soak in for a few minutes. Place the ground meat, milk-soaked bread, Parmesan, grated onion, salt, some pepper, seasoned salt and parsley in a large mixing bowl. Pour in the eggs. Mix the ingredients until well combined. **If the mixture is too wet, add some bread crumbs as needed.
Form the mixture into a loaf shape on a foil-lined broiler pan, which will allow the fat from the meat to drain.
Next, make the sauce: Pour the ketchup into a bowl. Add the brown sugar and dry mustard, and splash in the hot sauce and Worcestershire sauce. Stir the mixture until well combined. Pour one-third of the sauce over the top of the meatloaf.
Bake for 45 minutes, and then pour over another one-third of the remaining sauce over the meatloaf. Bake for an additional 20 to 25 minutes; the meatloaf should be no longer pink in the middle. Allow to sit 10 minutes before serving.
Serve with the remaining sauce on the side as a dipping sauce.