Prepare the Oven and Baking Sheet
Preheat oven to 400℉ (200℃). Line a large baking sheet with parchment paper and lightly spray it with cooking spray.

Mix the Bread Crumb Mixture
In a large bowl, mix together panko crumbs, milk, kosher salt, garlic powder, egg, and olive oil. Let it sit for a few minutes so the crumbs absorb the liquid.

Prepare the Meatball Mixture
Add minced chicken and parmesan cheese (if using) to the bowl. Mix until just combined—do not overmix.

Shape the Meatballs
Using a cookie scoop or spoon, portion the mixture into 18-20 equal balls. Wet your hands slightly to prevent sticking and roll each into a smooth ball.

Prepare for Baking
Place the meatballs on the prepared baking sheet. Lightly spray the tops with cooking spray for a golden finish.

Bake and Serve
Bake for 20 minutes. For extra browning, broil for 2-3 minutes at the end. Serve with marinara sauce, pasta, or as appetizers.