INGREDIENTS
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110g (4 oz) all-purpose flour
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1 teaspoon baking powder
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125g (4.5oz or slightly more than 1 stick) salted butter, room temperature
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1 teaspoon vanilla extract
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80g (3 oz) fine sugar
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2 large eggs2 tablespoons milk
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60g (2 oz) walnut, processed in a food processor until fine
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30g (1 oz) whole walnut, for topping