INGREDIENTS
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2¾ cups all-purpose flour
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2½ teaspoons cream of tartar
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1 teaspoon baking soda
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¼ teaspoon salt
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¾ cup (1½ sticks) unsalted butter, softened
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¼ cup butter-flavored shortening or leaf lard
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1¾ cups granulated sugar, divided
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1 egg
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2 egg whites
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1 tablespoon ground cinnamon
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FOR SANDWICHES
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1 pint vanilla ice cream
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2 cups toffee pieces