Preheat oven to 400 degrees Fahrenheit. In a large bowl, add ground beef, garlic, salt, pepper, Worcestershire, parmesan, breadcrumbs, diced onion and egg. Combine well with a fork or your hands.

Lightly grease a cookie sheet or line it with a non-stick baking mat. Form/roll meat into 1 1/2" balls and place on prepared sheet, a few inches apart. Bake for 18-22 minutes, or just until meat is no longer pink inside.