Dinner Spanakopitas

Name: Dinner Spanakopitas
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: European, Mediterranean, Greek
Ingredients: 1/4 cup good olive oil; 1 cup chopped yellow onion; 3 scallions, white and green parts, chopped; 20oz frozen chopped spinach, defrosted; 4 extra-large eggs, lightly beaten; 3 tablespoons freshly grated Parmesan cheese; Plain dry bread crumbs; 1 teaspoon grated nutmeg; 2 teaspoons kosher salt; 1 teaspoon freshly ground black pepper; 2 cups small-diced feta cheese (12 ounces); 3 tablespoons toasted pine nuts; 24 sheets frozen phyllo dough, defrosted; 1 stick) unsalted butter, melted; Flaked sea salt, such as Maldon, for sprinkling