INGREDIENTS
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1 cup walnut pieces, roughly chopped
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1 cup unbleached all-purpose flour, plus more for rolling
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1/3 cup unsweetened cocoa powder
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1/2 cup packed dark brown sugar
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1/4 granulated sugar
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2 tbsp unsalted butter, cut into small pieces, at room temperature
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1/4 tsp baking soda
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1/4 tsp kosher slat
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2 large eggs
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1 large egg yolk
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3/4 tsp pure vanilla extract
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1/2 cup semisweet chocolate chips
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Coffee extract:
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1/4 cup hot water
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2 oz instant espresso powder