In a small bowl, whisk together the flour, baking soda, salt, and all of the spices. Set aside.
In a separate large bowl, beat together the softened butter and brown sugar until light and fluffy.
Beat in the egg, crystallized ginger, and molasses.
Add the dry ingredients, beating gently until evenly blended.
Cover the bowl and chill the dough for a minimum of 1 hour but overnight refrigeration is better.
Preheat the oven to 400°F. Line two baking sheets with parchment paper or a silicone baking mat.
Shape the dough into 1" balls, and roll each ball in sparkling sugar.
Place the balls of dough 2" to 3" apart on the prepared pans.
Bake the cookies in the center of the oven for 10 to 15 minutes, until they're golden and set.
Remove the cookies from the oven, and cool them on the pans for 5 minutes. Remove them to a cooling rack to cool completely.