INGREDIENTS
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1tablespoonolive oil, plus more for the baking dish
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6shallots, thinly sliced
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kosher salt and black pepper
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1cupdry white wine
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6large eggs
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1cupheavy cream
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1cupwhole milk
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1/4teaspoongrated nutmeg
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410-ounce packages frozen spinach, thawed and squeezed to remove excess moisture
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8ouncesgrated Gruyère (8 ounces)
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1/2cupgrated Parmesan (2 ounces)