In a medium bowl, mix dry ingredients, flours through cinnamon.
In a large bowl, use an electric mixer to combine butter and sugar. Blend in the egg and then the molasses. Add in the dry ingredients, a little at a time, until you can no longer see any streaks of flour. Cover the bowl with plastic wrap and refrigerate for at least 4 hours.
3. Preheat oven to 350 degrees and line cookie sheets with parchment paper or silpat mats.
Scoop out a spoonful of the dough, roll it into a ball with clean hands and roll it in the bowl of sugar. Place it on the cookie sheet and continue with the remaining cookie dough. Bake for 10 to 12 minutes, or until the cookies are crackled and set. Let the cookies cool for 10 minutes on the cookie sheet, then remove them to a wire rack to cool completely.
Notes
These cookies freeze well. Just store them in a covered container.