INGREDIENTS
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3/4 cup butter, softened
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1 cup sugar
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3/4 cup Dutch-process cocoa powder
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1/2 teaspoon ground cinnamon
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1/4 teaspoon salt
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1/4 teaspoon cayenne pepper
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1 egg
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1 1/2 teaspoons vanilla
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1 1/4 cups all-purpose flour
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1/2 cup dulce de leche*