In a large bowl, combine ground beef with bacon, cheese, eggs, mayo, Worcestershire sauce, breadcrumbs and salt & pepper.
Mix in half of the ketchup/mustard mixture into the meat mixture. Form into a loaf and place in a 9”x5” loaf pan.
Spread remaining ketchup/mustard mixture over the top of the meatloaf.
Bake uncovered 40 minutes.
Sprinkle with onions and continue baking for another 10 -15 minutes. Or until meat is no longer pink in the center. (beef is done when internal temperature reaches 160 degrees F)