For the meatballs: Place the ground meats, bread crumbs, parsley, Parmesan, salt, pepper, onion powder, egg, and 3/4 cup warm water in a bowl. Mix very gently with a fork or your fingers until just combined. You don’t want to overmix the meat (if you look closely, full pieces of ground meat should still be visible), as that will result in dense, tough meatballs and bland flavor. Using your hands, lightly form the mixture into 2-inch meatballs. I always end up with about 21-24 meatballs, but you can make yours smaller or bigger as you wish.

Pour equal amounts of vegetable oil and olive oil into a large skillet (mine was a 12-inch, 3-quart pan and was a bit too small for all of the meatballs and sauce) to a depth of about 1/4-inch. Heat the oil over medium heat. Working in batches, place the meatballs in the oil and brown them well on all sides, turning carefully with tongs or a fork, taking about 5 minutes per batch. Remove the meatballs to a plate covered with paper towels to drain. Pour out the excess oil but don’t clean the pan - all of those stuck, charred meat bits will flavor the sauce.

For the sauce: Heat the olive oil in the same pan over medium heat. Add the onion and cook until translucent and softened, about 7 minutes. Add the garlic and red pepper flakes, and cook for 1 more minute. Add the wine and cook on high heat, scraping up all the brown bits in the pan, until almost all the liquid has evaporated, about 3 minutes. Stir in the tomatoes, parsley, salt, and pepper.

Return the meatballs to the sauce, cover, and gently simmer for 25 to 30 minutes, until the meatballs are cooked through. I usually just poke a meatball open and look inside - the meat in the middle should be brown and juices should run clear. Meatballs are also hard to overcook since they’re basically just braising in liquid, which I also like for a weeknight meal.

Serve: hot on cooked spaghetti and top with more grated Parmesan, if desired.