INGREDIENTS
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Casserole:
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1 tablespoon unsalted butter, softened, for the casserole dish
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1 loaf Italian-style bread, cut into 18 half-inch-thick slices (about 1 pound)
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6 large eggs
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1/3 cup granulated sugar
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2 teaspoons pure vanilla extract
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1/2 teaspoon ground cinnamon
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Kosher salt
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2 cups whole milk
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1 cup heavy cream
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Brown Sugar Crumble:
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3/4 cup packed light brown sugar
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1/4 cup all-purpose flour
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1/2 teaspoon ground cinnamon
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1/4 teaspoon freshly grated nutmeg
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Kosher salt
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1 stick unsalted butter, cut into cubes
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1 cup chopped walnuts