Prepare the Meat Mixture:
In a large bowl, mix together the ground beef, breadcrumbs, Parmesan cheese, milk, eggs, Worcestershire sauce, salt, and pepper. Combine thoroughly until all ingredients are evenly incorporated.
Form the Loaf:
Shape the beef mixture into a loaf form. Place the loaf carefully in your crockpot.
Caramelize the Onions:
Melt butter in a skillet over medium heat. Add the thinly sliced onions and cook them slowly, stirring occasionally, until they become caramelized, which takes about 20-25 minutes. Once caramelized, pour in the beef broth and continue cooking until most of the liquid is absorbed.
Add Onions to the Meatloaf:
Pour the caramelized onions with broth over the meatloaf in the crockpot.
Slow Cook the Meatloaf:
Set the crockpot to low and cook the meatloaf for 6 to 8 hours, or until it reaches the desired doneness.
Melt the Cheese:
About 10 minutes before serving, lay Swiss cheese slices over the top of the meatloaf. Cover and allow the cheese to melt.
Serve and Enjoy:
Serve the meatloaf hot, sliced with the gooey melted cheese on top, and enjoy the rich, savory flavors!
Prep Time: 20 minutes | Total Time: 6-8 hours | Servings: 6-8
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