Prepare the Meatloaf Mixture: In a large bowl, mix together the ground beef, French onion soup mix, breadcrumbs, Parmesan cheese, milk, egg, and 1/4 cup of ketchup until well combined.
Shape and Place in Slow Cooker: Shape the mixture into a loaf and place it in your slow cooker.
Add Toppings: Spread the remaining 1/4 cup of ketchup over the top of the meatloaf. Layer the thinly sliced onions on top of the ketchup.
Drizzle with Worcestershire Sauce: Drizzle the Worcestershire sauce over the onions.
Cook: Cover and cook on low for 6-7 hours, or until the meatloaf reaches an internal temperature of 160°F (70°C).
Rest and Serve: Let the meatloaf rest for about 10 minutes before slicing and serving. Sprinkle with fresh parsley, if desired.
Enjoy this flavorful and comforting dish with your favorite sides. Bon appétit!
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