Transfer all ingredients into a bowl and, and mix well, using your hands. Don't 'overmix' as that could result in dense, tough meatballs.
Form the meatballs, the size is slightly bigger than a golf ball. You should be able to make 3-4 meatballs.
Heat oil on an oven-safe skillet and brown the meatballs on all sides.
Move the skillet into the oven and cook for another 10 minutes. (NOTE 2)
Make your other dish (like my suggested Zucchini Orzo) to complete your meal.
Serve and enjoy!
Notes
My preferred ground beef mixture is 80:20 (80% lean and 20% fat). Other mixture can work as well. In general, the leaner the meat, the quicker it dries out, so you need to pay more attention to your cooking time.
The cooking time in the oven is something that very much depends on the size of your meatballs and your final decision on the lean meat: fat ratio.