Preparation :

Cook onions and mushrooms in butter in skillet, stirring occasionally, until soft. Let cool. Beat eggs in a large bowl, until frothy. Stir in cooled onions and mushrooms, spinach, breadcrumbs, soup, two tablespoons of cheese, salt, pepper, basil and nutmeg until well combined. Spread mixture in a 9 x 9 x 2 baking dish. Sprinkle evenly with remaining cheese. Bake uncovered in 325F oven until set (about 1 hour).

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