Preheat oven to 325 degrees.
Trim and wash the spinach. In a large pot of salted, boiling water add spinach. Simmer the spinach, stirring occasionally, for 10 minutes. Then drain, refresh, and squeeze dry.
Saute the onions in the butter until tender. Add the cooked spinach, sour cream, cream cheese, grated Parmesan cheese, salt, pepper and nutmeg to taste. Transfer mixture to a buttered baking dish.
Saute 1/2 cup bread crumbs in 2 tablespoons of butter until browned. Sprinkle bread crumbs on spinach. Put it in the oven and bake for 20 minutes, then serve.
Suggested drink: Beck's Beer