01 -
In a large mixing bowl, blend ground beef, breadcrumbs, Parmesan cheese, milk, eggs, Worcestershire sauce, salt, and pepper until mixture is completely uniform.
02 -
Form the meat mixture into a compact loaf and place gently into the base of the crockpot.
03 -
In a medium skillet over medium heat, melt butter. Add sliced onions and cook, stirring occasionally, for 20 minutes or until deeply golden and softened.
04 -
Add beef broth to the caramelized onions and cook for 2 minutes, stirring to incorporate thoroughly.
05 -
Spoon the onion and broth mixture evenly over the beefloaf in the crockpot.
06 -
Cover and cook on low heat for 6 to 8 hours, or until meatloaf is cooked through and juices run clear.
07 -
Ten minutes before serving, arrange Swiss cheese slices over the hot beefloaf, cover, and allow to melt completely.
08 -
Slice the beefloaf and serve warm, ensuring each portion is covered with melted cheese and caramelized onions.