Whisk flour, salt, baking powder, cinnamon, and nutmeg in a medium bowl. You could definitely play around and add ground cloves, cardamon, or a little more nutmeg. Anytime I’m using a leavening agent such as baking powder, I want to make sure that it’s mixed thoroughly. It must be spread throughout so that not only the cake rises, but you also won’t end up with pockets of unmixed baking powder.