Preheat oven to 350 degrees F. Grease a 1-1/2-quart casserole; set aside. In a large bowl, combine eggs, cottage cheese, spinach, feta cheese, melted butter, flour, dried onion, and nutmeg. Transfer mixture to the prepared casserole.
Bake, uncovered, about 45 minutes or until center is nearly set (160 degrees F). Makes 4 servings.