INGREDIENTS
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1 1/2 cups all-purpose flour
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5 Tbsp icing sugar
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3/4 cup cold unsalted butter
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1/2 cup walnut pieces, lightly toasted
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1/2 cup chocolate chips
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1 cup packed light brown sugar
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2/3 cup maple syrup or corn syrup
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6 Tbsp unsalted butter, melted
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3 large eggs, at room temperature
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1 Tbsp white vinegar
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2 tsp vanilla extract