Preheat and prep the pan: Preheat oven to 400°F and lightly grease a large baking dish.
Mix the meatball mixture: In a large bowl, combine 1 pound ground chicken, 1 large egg, 2 tablespoons olive oil, 1/2 cup Panko breadcrumbs, 1/2 cup Parmesan cheese, 2 tablespoons parsley, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon smoked paprika, 1/2 teaspoon cayenne pepper, 1/2 teaspoon salt, and 1/4 teaspoon black pepper. Mix gently until just combined.
Form the meatballs: Shape into 12 large meatballs (about two golf balls each) and place in the baking dish.
Bake: Bake at 400°F for 25 minutes, until cooked through and lightly golden.
Add sauce: Pour 24 oz spaghetti sauce over and around the meatballs.
Top with cheese: Lay 8 oz sliced mozzarella cheese over the top.
Bake again: Bake for 10 minutes until melted and bubbly.
Broil: Broil for 2–3 minutes until golden and lightly browned.
Rest: Let sit for 5 minutes before serving.