INGREDIENTS
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1 tablespoon bacon grease
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1 (1 pound) loaf day-old bread, cubed
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12 large eggs
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2 teaspoons kosher salt
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1/2 teaspoon freshly ground black pepper
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1 pinch cayenne pepper
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1 pinch freshly grated nutmeg
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2 1/2 cups heavy cream
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1 pound sliced bacon, cut crosswise into 1/2-inch strips
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1 pound fresh spinach, wilted, squeezed dry
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12 ounces shredded extra-sharp Cheddar cheese, divided