01 -
In a medium mixing bowl, whisk the egg until smooth, then blend in the chopped basil, salt, pepper, oregano, minced garlic, and water until well combined. Add the diced onion, ground turkey, breadcrumbs, and grated cheese to the bowl. Using clean hands, gently mix everything together until just combined and uniform - don't overmix as this can make the meatballs tough.
02 -
Lightly dampen your hands with cool water to prevent sticking. Roll the mixture into balls slightly larger than golf balls - you should get about 18 meatballs total. Keep a small bowl of water nearby to re-wet your hands as needed while shaping.
03 -
Heat the olive oil in a large nonstick skillet over medium heat until it shimmers and moves easily around the pan. Carefully place the meatballs in a single layer, making sure not to overcrowd them. Brown them evenly on all sides, turning gently with tongs, for about 7-8 minutes total until they develop a golden crust.
04 -
Pour the marinara sauce over the browned meatballs and bring the mixture to a gentle boil. Once bubbling, reduce heat to low, cover the skillet tightly with a lid, and let simmer for 15 minutes until the meatballs are completely cooked through and tender. Garnish with additional fresh basil and grated cheese before serving.