INGREDIENTS
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3 tablespoons unsalted butter
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6 ounces Canadian bacon, cut into 1/2-inch pieces
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1 small onion, finely chopped
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1 garlic clove, minced
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1 pound baby spinach (10 cups)
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Coarse salt and ground pepper
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9 large eggs
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3 cups whole milk
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1/2 teaspoon ground nutmeg
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8 cups 1 1/2-to-2-inch cubes Italian bread (from a 1-pound loaf)
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6 ounces Gruyere cheese, grated (about 1 1/2 cups)