Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
In a medium bowl, whisk together the flour, spices, salt, and baking soda.
In a large mixing bowl, cream butter and sugars together until light and fluffy (2–3 minutes).
Beat in egg, then molasses and vanilla until fully combined.
Gradually add the dry ingredients to the wet, mixing until just combined.
Roll dough into 1-inch balls, then roll in extra sugar.
Place on prepared baking sheet 2 inches apart.
Bake for 9–11 minutes, until edges are set and tops crack slightly.
Let cool on pan for a few minutes before transferring to a wire rack.