Preheat oven to 450 degrees. Generously grease a 12 cup muffin pan. In a small bowl, combine balsamic vinegar and ketchup. Mix and set aside.
In a large bowl, combine ground beef, garlic, parsley, honey, panko crumbs, salt and pepper. Use hands to gently mix to combine all ingredients. Form into balls and place in a muffin tin.
Brush balsamic and ketchup mixture over the tops of the meatloaf muffins.