01 -
In a large mixing bowl, thoroughly blend ground beef, breadcrumbs, Parmesan cheese, milk, eggs, Worcestershire sauce, salt, and pepper until uniform.
02 -
Form the beef mixture into a compact loaf and arrange gently in 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 -
Stir in beef broth to the caramelized onions, allowing it to absorb and enrich the mixture for 2 minutes.
05 -
Evenly spoon the caramelized onion and broth mixture over the prepared beefloaf inside the crockpot.
06 -
Cover and cook on low heat for 6 to 8 hours, or until the loaf is cooked through and juices run clear.
07 -
About 10 minutes before serving, layer Swiss cheese slices on top of the hot beefloaf, cover, and allow to melt completely.
08 -
Slice and serve warm, ensuring each portion is topped with melted cheese and caramelized onions.