01 -
In a large mixing bowl, combine ground beef, breadcrumbs, Parmesan cheese, milk, eggs, Worcestershire sauce, salt, and pepper. Mix thoroughly until evenly blended.
02 -
Form the beef mixture into a loaf shape and carefully place it in the bottom of the crockpot.
03 -
Melt butter in a medium skillet over medium heat. Add sliced onions and cook, stirring occasionally, until deeply golden and tender, about 20 minutes.
04 -
Add beef broth to the caramelized onions and stir, allowing the mixture to absorb the flavors for 2 minutes.
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 fully cooked and juices run clear.
07 -
Ten minutes before serving, layer Swiss cheese slices over the hot beefloaf. Cover and let the cheese melt thoroughly.
08 -
Slice the beefloaf and serve warm, ensuring each portion is topped with melted cheese and caramelized onions.