01 -
In a large mixing bowl, gently combine ground beef, breadcrumbs, Parmesan cheese, milk, eggs, Worcestershire sauce, salt, and pepper until just combined to maintain tenderness.
02 -
Form the mixture into a loaf shape that fits comfortably in your slow cooker, avoiding excessive compression to preserve lightness.
03 -
Melt butter in a large skillet over medium heat. Add the sliced onions and cook slowly, stirring every few minutes, for approximately 20 minutes until golden, soft, and fragrant.
04 -
Add broth to the caramelized onions, stirring to deglaze the pan. Simmer for one minute allowing onions to absorb the broth and flavors.
05 -
Evenly spoon the onion and broth mixture over the shaped beef loaf in the slow cooker to ensure flavor distribution.
06 -
Cover and cook on low heat for 6 to 8 hours, or until the beefloaf is cooked through and firm to the touch, with clear juices.
07 -
About 10 minutes before serving, layer Swiss cheese slices atop the loaf. Cover again to melt the cheese to a gooey consistency.
08 -
Carefully slice the beefloaf and serve warm, optionally topped with extra caramelized onions and melted cheese for enhanced flavor.