Prepare a large piece of foil by spraying it with cooking spray and set aside.

In a medium bowl, combine ground beef, diced onion, garlic, parsley, Italian seasoning, salt, pepper, milk, Worcestershire sauce, eggs, and breadcrumbs. Mix gently by hand until just combined.

Shape the meat mixture into a loaf and place it on the prepared foil. Fold the foil up around the sides of the loaf to form a cooking tray. Place into one side of a 6-quart slow cooker.

Add baby potatoes to the other half of the slow cooker. Drizzle with melted butter and add minced garlic and salt. Stir to coat the potatoes evenly.

Cover the slow cooker with the lid and cook on low for 6 hours, or until the meatloaf reaches an internal temperature of 170°F.

In a small bowl, mix 1/2 cup of the ketchup with brown sugar. Brush the mixture over the top of the meatloaf during the last 30 minutes of cooking.

Cover and cook for the remaining 30 minutes. Slice meatloaf and serve with potatoes. Enjoy!