Turkey Meatloaf

Name: Turkey Meatloaf
Ingredients: 1 1/2 pounds lean ground turkey; 1 onion, chopped; 1 bunch fresh spinach, thick stems removed and leaves chopped (about 4 cups); 1 cup flat-leaf parsley, chopped; 1/2 cup whole-wheat bread crumbs; 2 tablespoons Dijon mustard; 1 large egg white; salt and black pepper; 1/4 cup ketchup; 1/4 cup marinara sauce (optional)