Combine butter, brown sugar, and molasses in a large mixing bowl and beat until smooth. Add egg and beat to combine. Whisk together flour, baking soda, and all of the spices. Slowly add dry ingredients to the wet ingredients and beat to combine. Chill the dough in the refrigerator for at least 1 hour.

Preheat oven to 350°F. Scoop about 2 Tbsp of cookie dough and roll into a balls. Place balls on a parchment or lined baking sheet. Bake 13-14 minutes, until firm to the touch. Remove from oven and cool on the sheets for 3 minutes.

Place powdered sugar in a medium sized container with a lid. Drop a few cookies at a time into the powdered sugar. Cover with a lid and shake gently to coat. Transfer the coated cookies to a wire cooling rack and let cool completely. Repeat with all the cookies. Store in an airtight container.