Spinach And Scallion Dutch Baby

Name: Spinach And Scallion Dutch Baby
Ingredients: 1 pound baby spinach; 4 large eggs; 1 cup milk; 1 cup all-purpose flour; Kosher salt and freshly ground pepper; Pinch of freshly grated nutmeg; 4 tablespoons unsalted butter; 4 large scallions, thickly sliced; 2 tablespoons freshly grated Parmesan cheese