Combine the flour, baking powder, salt and spices in a bowl. Reserve.
In the bowl of a stand mixer fitted with the paddle attachment, combine the butter and the brown sugar, and cream on medium until smooth and fluffy, about 10 minutes, scraiping the bowl and paddle as needed.
Add the egg and mix until combined.
Add the dry ingredients and continue mixing until the dough begins to come together. Transfer the dough onto the counter and gently knead to form a ball. Pat into a disc, wrap with plastic and refrigerate for 1 hour or up to 1 day.
Preheat oven to 350 degrees F with the rack adjusted to the lower middle position.
Place the dough in between two sheets of parchment paper and roll to a thickeness of 1/12-inch.
Using a fluted pastry wheel, cut the dough in 1-inch strips lengthwise, then cut crossways to form 2-inch rectangles. You can use a ruler or free hand. Use an offset spatula to help you loosen the dough from the parchment paper and transfer to a parchment paper llined baking sheet, leaving about 1 inch space between the cookies to account for some spreading.
Bake the cookies until they are golden brown, about 15 minutes, rotating the baking sheet halfway through for even browning.
Remove the baked cookies from the oven and let them cool slightly on the pan before transferring to a wire rack so they can cool completely.