Preheat your oven to 375 degrees F (190 degrees C). Prepare a baking sheet by lining it with parchment paper.

In a large bowl, combine the ground beef, breadcrumbs, milk, egg, onion, garlic, salt, pepper, and Worcestershire sauce. Use your hands to mix everything until well combined.

Take a small portion of the meat mixture (about the size of a golf ball) and flatten it in your palm. Put a small amount of cheddar cheese in the center and then mold the meat around the cheese to form a tight ball. Place it on the prepared baking sheet.

Repeat the process with the remaining meat and cheese until all ingredients are used. Leave a bit of space between each meatball on the baking sheet.

In a small bowl, mix together the ketchup and mustard. Brush this mixture generously over the top of each meatloaf bite.

Place the baking sheet in the oven and bake for 25-30 minutes until the meatloaf bites are cooked through and the tops are caramelized.

Once done, remove them from the oven and garnish with additional chopped parsley before serving.