Preheat oven to 450 degrees. Spray a rimmed baking sheet with non-stick cooking spray.

In a large mixing bowl, toss bread crumbs with 3 tablespoons of milk. Let rest, moistening with additional milk if dry.

Add parmesan, onion, garlic, parsley, basil, and oregano; mix well.

Add ground turkey. Sprinkle with salt and pepper. Break egg yolk and drizzle over mixture.

Mix with clean hands until well combined. Form into 16 meatballs.

Place meatballs on prepared baking sheet. Brush with olive oil.

Bake for 10 minutes; turn over if golden, bake additional 5 minutes or until internal temperature reaches 165°F.

While baking, heat marinara sauce on low heat in a saucepan.

Toss meatballs with warm marinara sauce and serve garnished with herbs if desired.