1
In a large mixing bowl, combine the minced beef, chopped onion, minced garlic, egg, breadcrumbs, Parmesan cheese, mozzarella cheese, parsley, salt, and pepper. Mix well with your hands until just combined.
2
Using your hands, shape the mixture into small meatballs, about 1 1/2 inches in diameter. You should end up with around 20-25 meatballs.
3
Place the flour, eggs, and milk in three separate shallow dishes. Season the flour with salt.
4
Dip each meatball first in the flour, coating it lightly, then in the eggs, making sure they are fully coated, and finally in the milk, making sure they are fully coated.
5
Heat about 1-2 inches of vegetable oil in a large frying pan over medium-high heat. When the oil is hot, add a few of the meatballs to the pan and fry until they are golden brown on all sides, about 3-4 minutes. Repeat with the remaining meatballs.
6
Using a slotted spoon, remove the meatballs from the oil and place them on a paper towel-lined plate to drain any excess oil.
7
Serve the meatballs hot with your favorite tomato sauce and pasta.