Coat the bottom of a large saute with the olive oil and cook pancetta until brown and remove from pan. Leaving some oil in the pan. Cook onions, garlic, mushrooms until soft in pan. Scrape up any brown bits. Add beef base, Worcestershire sauce, cook until the beef base has melted down. Remove from heat and let cool.
In a small bowl soak bread in the milk for 10 minutes.
In a large bowl mix together the meat, bread, onion mixture, pancetta, ketchup, egg parsley until well blended. Season with salt and pepper.
In a standard size bread pan, place meatloaf and pat it down so any air bubbles are removed.
Bake in the oven for one hour or until the internal temperature reaches 165 degrees.