DO-AHEAD TIP: Refrigerate meatball mixture for 20 minutes (see recipe).
Place all ingredients in a large bowl. Using your very clean hands, blend thoroughly; cover with plastic wrap and refrigerate for at least 20 minutes.
Preheat oven to 400 degrees and line a baking sheet with foil wrap. Shape ground beef mixture into small round balls, placing them on the baking sheet as you go.
Bake meatballs for 30 minutes or until browned and cooked through. Remove from the oven and serve.