In a large bowl, combine flour, powdered sugar, salt, baking soda, baking powder, and the scrapings of one large vanilla bean, mixing by hand until the seeds are well dispersed.
1 1/3 cup all purpose flour, 1/4 cup icing sugar, 1/2 tsp kosher salt, 1/2 tsp baking soda, 1/2 tsp baking powder, 1 vanilla bean