Some authentic spanakopita recipes available on the Food Network call for spinach, feta cheese, eggs, herbs and phyllo dough. Another authentic recipe, Greek Spinach and Feta Pie Spanakopita, from Fine Cooking, uses scallions, kefalotyri cheese and nutmeg.
To make Fine Cooking's spanakopita recipe, saute 2 pounds of chopped fresh spinach at medium-high heat, just until the spinach wilts. Allow it to drain while cooking 1 bunch of minced scallions in 3 tablespoons of extra virgin olive oil for four minutes. After the cooked scallions cool for a few minutes, add back in the spinach, 2 cups of crumbled feta cheese, 1/2 cup of grated Greek kefalotyri cheese or Parmigiano-Reggiano cheese, and 2 beaten eggs. Season the mixture with 1/2 cup of finely chopped fresh dill, 1/3 cup of finely chopped fresh parsley, 1/4 teaspoon of freshly grated nutmeg and 1/2 teaspoon of salt.
Brush 9 phyllo sheets with oil, and lay them in the bottom of a baking pan. Spoon the spinach filling over them, and top the spanakopita with 9 more oiled and layered phyllo sheets. Lightly score the phyllo topping with a knife, and drizzle 2 teaspoons of whole milk over it. Bake the spinach pie at 375 degrees Fahrenheit for 35 to 45 minutes.
Sofia's Spanakopita from the Food Network suggests adding 4 minced garlic cloves, 4 chopped shallots, 4 cups of minced leeks and 4 cups of ricotta cheese to the filling.