Spray the slow cooker with nonstick spray or line with foil for easy cleanup if not using nonstick or ceramic.
2 pounds 80% ground beef, 2 large eggs, 1 medium onion, 2/3 cup milk, 1 cup panko, 2/3 cup ketchup, 1/4 cup fresh parsley, 1 teaspoon granulated garlic, 1 1/2 teaspoons salt, 1/2 teaspoon black pepper
In a large bowl, combine the ground beef, eggs, onion, milk, panko, ketchup, parsley, garlic, salt, and pepper. Mix gently until just combined.
Shape into a loaf that fits your slow cooker and place inside.
In a small bowl, whisk together the ketchup, brown sugar, and Worcestershire sauce. Spread half evenly over the top of the meatloaf. Refrigerate the remaining half, and when ready to use, add spoonfuls carefully to avoid cross-contamination.
1 cup ketchup, 2 teaspoons brown sugar, 1-2 teaspoons Worcestershire sauce
Cover and cook on low for 6 hours, or until the internal temperature reaches 160°F (per USDA guideline for safe ground beef).
Carefully remove the meatloaf and discard any rendered fat if desired and then spread on the remaining glaze.
For a caramelized finish, place the glazed loaf on a foil-lined baking sheet and broil for 3-5 minutes, or finish in the slow cooker for another 30 minutes on low.
Rest the meatloaf for 10 minutes before slicing.
Video
Notes
Substitutions: Use ground turkey or chicken instead of beef for a lighter version. Swap ketchup with barbecue sauce for a smoky flavor.
Storage: Refrigerate leftovers in an airtight container up to 4 days or freeze slices up to 3 months.
Reheat: Microwave slices 1-2 minutes or reheat in a 350°F oven until warmed through.