Preheat oven to 325F and line a baking sheet with parchment.
In a medium bowl, whisk flour with baking soda, spices and salt.
In the bowl of a standmixer, cream butter and sugar together until light and fluffy, about 3 minutes. Add egg yolks and vanilla extract. Slowly add in flour mixture – the dough may seem dry at first but keep mixing at a low speed and it will incorporate.
Scoop dough into 1-inch balls and place 2 inches apart on a baking sheet.
Bake in the centre of the oven for 12-15 minutes, allow to cool for 5 minutes on the baking sheet then transfer to a wire rack to cool completely.
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