03Preheat the oven to 400 degrees. Place half of the greens in a food processor and pulse until the pieces are about the size of a grain of rice. Transfer to a large mixing bowl. Repeat with the remaining greens. Process the scallions and herbs to a rough paste and mix into the greens. Stir in the egg, cheeses, 3 tablespoons olive oil and nutmeg. Season to taste with salt.04Line a large cookie sheet with parchment paper and set aside. Flour a flat surface and roll one of dough balls into a circle about 16 inches in diameter, 1/8- to 1/16-inch thick, and lay it on the cookie sheet. Scoop the filling onto the dough and spread it evenly to 3/4 inch from the edge. Add more flour to the surface, roll out the second ball of dough and drape it across the filling. Trim the top layer so it hangs over the filling by 1/2 inch. Pinch together the layers. (If the dough doesn't stick, moisten the edges with a little water.) Slash two vents into the top of the pie and brush with the remaining 2 tablespoons olive oil.05Bake until the pie is slightly puffy in the center and the filling has set, 40 to 50 minutes. If the top crust browns too quickly, cover it with foil. Cool before eating. It will keep 3 to 4 days at room temperature. If refrigerated, warm the slices in a skillet before eating.