Put the ground beef, minced garlic, egg, grated Parmesean, onion powder, Kosher salt, pepper, and chili flakes (if desired) in a bowl and mix gently with your fingers.
Add your bread crumbs to the bowl and mix gently.
Slowly add the lukewarm water and combine with your fingers. Your mixture will be very moist, but should still hold it’s shape if rolled into meatballs.
Pour 3 tablespoons of olive oil into a heavy bottomed pan. I like to use my Le Creuset braiser which browns the meat beautifully while still allowing for a clean release.
Turn your stove to medium high.
When the oil is glistening, portion out your meatballs and place them into the pan with some room between them. I like to make 3 tablespoon sized meatballs using a cookie scoop.
Cook for about 5 minutes, until the meatball is browned and released easily from the pan, then turn them over to brown on the other side.
Cook for another 3 minutes until they are browned and release easily.
Add 1/4 cup of olive oil and the rest of the minced garlic to the pan with the meatballs, then pour in the passata and the rest of the Kosher salt and mix.
Turn the heat to medium low, cover the pan, and leave the meatballs and sauce to simmer for 15 minutes.
Toss in the basil leaves and mix.