INGREDIENTS
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Butter, for greasing the pan
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1 (14-ounce) can sweetened condensed milk
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2 teaspoons ground cinnamon
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1 teaspoon pure vanilla extract
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1 pound (about 2 cups) bittersweet (60 percent cacao) chocolate chips (recommended: Ghiradelli) see Cook's Note
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3 tablespoons unsalted butter, cut into 1/2-inch pieces, at room temperature
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Kosher or flake salt, optional
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