Make Crepes: Mix eggs, milk, and melted butter. Whisk in flour and salt until smooth. Let batter rest in the fridge for an hour. Then cook in a buttered skillet to make thin, 8-inch crepes.
1 cup + 2 tablespoons flour, ¾ cup whole milk, 2 eggs, 3 ½ tablespoons butter, Salt to taste
Prepare Filling: Roughly chop boiled and drained spinach. Mix with drained ricotta, one egg, grated Parmigiano, a sprinkle of fresh nutmeg, freshly ground pepper, and salt.
5 ¼ cups spinach, 1 cup ricotta cheese, ⅓ cup grated Parmigiano Reggiano, 1 egg, Nutmeg to taste, Black pepper to taste
Assemble and Cook: Fill each crepe with about 2 tablespoons of spinach mixture, fold sides inward. Place filled crepes in a béchamel-lined baking dish. Cover with more béchamel, dollops of tomato sauce, and sprinkle generously with Parmigiano. Bake at 350°F (180°C) for 15-20 minutes until golden.
2 cups béchamel sauce, 4 tablespoons ready-made tomato sauce, Extra Parmigiano Reggiano for sprinkling