01 -
In a spacious mixing bowl, gently combine the ground beef, breadcrumbs, grated Parmesan cheese, milk, eggs, Worcestershire sauce, salt, and black pepper. Mix thoroughly until just incorporated, taking care not to overwork the meat.
02 -
Carefully shape the beef mixture into an oblong loaf, ensuring it fits comfortably within your slow cooker. Avoid compacting the mixture too densely.
03 -
Heat the butter in a large skillet over medium heat. Add the thinly sliced yellow onions and cook, stirring periodically, for approximately 20 minutes, or until they achieve a deep golden, caramelized hue.
04 -
Pour the beef or chicken broth into the skillet with the caramelized onions. Stir well to deglaze the pan, scraping up any flavorful bits from the bottom. Allow the mixture to simmer for 1 minute.
05 -
Spoon the entire onion and broth mixture evenly over the shaped beefloaf positioned in the slow cooker.
06 -
Cover the slow cooker and cook on the 'low' setting for 6 to 8 hours, or until the beefloaf is thoroughly cooked, firm to the touch, and its internal juices run clear.
07 -
Approximately 10 minutes before you intend to serve, arrange the Swiss cheese slices uniformly over the top of the beefloaf. Re-cover and continue cooking until the cheese is beautifully melted and gooey.
08 -
Carefully lift or slice the beefloaf. Serve immediately, topped with extra caramelized onions and the melted Swiss cheese. For an extra crisp, cheesy finish, an optional brief broil can be applied just before serving.