Preheat your oven to 350°F (175°C).
In a large bowl, cream together butter and brown sugar until fluffy.
Beat in the egg and molasses until well combined.
In another bowl, whisk together flour, baking soda, spices, and salt.
Gradually add the dry ingredients to the molasses mixture, mixing until just combined.
Chill the dough in the refrigerator for 30 minutes.
Roll the dough into 1-inch balls and coat in granulated sugar.
Place on a baking sheet lined with parchment paper, spaced 2 inches apart.
Bake for 10-12 minutes until edges are set.
Cool on the baking sheet for a few minutes before transferring to a wire rack.