Combine flour, black sesame powder, salt, baking powder, and baking soda
Cream together the softened butter and sugar
Add egg yolks and mix until just combined
Add in dry ingredients and mix until just combined
Scoop 1 ½ tablespoonful cookie scoops and chill for 30 minutes
Bake at 325F for 8 minutes for extra soft and chewy cookies, or 10 minutes for less chewy
