Preheat the oven to 425 degrees F (220 degrees C). Line a large baking sheet with parchment paper.

Mix ground beef, onion, bread crumbs, Parmesan cheese, eggs, garlic, oregano, basil, Worcestershire sauce, thyme, salt, and black pepper in a large bowl until just combined. Divide mixture into 4 equal portions; roll each portion into 4 meatballs. Arrange meatballs on the prepared baking sheet.

Bake in the preheated oven until no longer pink in the centers, 15 to 20 minutes.