Turkey Meatball Pie

Name: Turkey Meatball Pie
Ingredients: 2 large eggs, divided; 1/2 c. chopped celery; 1/2 c. chopped carrots; 1/2 c. chopped onion; 2 cloves garlic, chopped; 1/2 c. chopped fresh parsley, plus more for garnish; 1 c. panko bread crumbs; 1/4 c. freshly grated Parmesan; kosher salt; Freshly ground black pepper; 1 lb. ground turkey; Extra-virgin olive oil, for drizzling; 2 c. prepared tomato sauce, divided; 1 c. cubed fresh mozzarella; 1 puff pastry sheet, thawed and cut into rectangles (keep chilled)