1.Preheat An Oven To 425 Degrees F (220 Degrees C). Line A Large Baking Sheet With Parchment Paper. 2.Mix Together The Ground Beef, Onion, Bread Crumbs, Parmesan Cheese, Eggs, Garlic, Oregano, Basil, Thyme, Worcestershire Sauce, Salt, And Pepper In A Large Bowl Until Just Combined. Divide The Mixture Into 4 Equal Portions, Then Roll Each Of Those Portions Into 4 Meatballs. Arrange The Meatballs On The Prepared Baking Sheet. 3.Bake In The Preheated Oven Until No Longer Pink In The Center, 15 To 20 Minutes.