Heat oven to 350℉.
Line 3 sheet pans with parchment paper. Set aside.
In a medium bowl, whisk together flour, spice, salt, and baking powder. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment (or with a hand mixer), beat butter and sugar until light and fluffy, about 3-4 minutes.
Beat in egg and vanilla.
Stir in dry ingredients.
Turn out onto a nonstick surface (silicone mat, parchment paper, marble slab).
Roll to ⅜ inch thick.
Cut with a 2½ inch cutter, re-rolling scraps as necessary.
Place cookies on prepared sheet pans.
Bake for 14-15 minutes, or until slightly colored around the edges.