Make the panade. In a large bowl, combine panko and milk. Let it soak for 3 minutes until it turns pasty. This keeps the meatballs tender—don't skip.

Build the meatball mix. Add ground turkey, grated onion, 2 minced garlic cloves, egg, parsley, Parmesan, oregano, 1 tsp salt, and 1/2 tsp pepper. Mix gently with your hands or a fork until just combined. Overmixing equals rubbery meatballs—hard pass.

Shape the meatballs. Roll into golf-ball-sized rounds (about 16). Wet your hands lightly if the mix is sticky.

Sear the meatballs. Heat 2 tbsp olive oil in a large skillet over medium-high. Sear meatballs in batches, turning until browned on most sides, 5–6 minutes total. They don't need to be cooked through yet. Transfer to a plate.

Sauté aromatics for the sauce. In the same pan, reduce heat to medium and add 1 tbsp olive oil if needed. Add 3 minced garlic cloves and a pinch of red pepper flakes. Stir 30 seconds until fragrant—no burning allowed.

Build the tomato sauce. Pour in crushed tomatoes. Season with 1 tsp salt and a few grinds of pepper. Swirl in balsamic. Simmer for 5 minutes, then nestle meatballs into the sauce. Cover partially and cook 10–12 minutes, turning once, until meatballs reach 165°F.

Cook the pasta. Meanwhile, boil spaghetti in aggressively salted water (it should taste like the sea) until just shy of al dente, 1 minute under package directions.

Finish like a pro. Reserve 1 cup of pasta water. Add drained spaghetti to the sauce with the butter and a splash of pasta water. Toss for 1–2 minutes until glossy and clinging. Adjust with more water for silkiness.

Taste and tweak. Add more salt, pepper, or a pinch of sugar if your tomatoes are extra tangy. Fold in basil.

Plate. Twirl spaghetti into bowls, top with meatballs, and shower with Parmesan. If you're not smiling, add more cheese.