Preheat oven to 350 degrees. Line baking sheets with parchment paper.

In the bowl of a mixer, beat the melted butter with the molasses, both sugars, and egg. In a small bowl, whisk together the salt, baking soda, spices, and flour. Add the dry ingredients to the wet and stir to form a cohesive dough.

Using a scoop or a tablespoon, roll the dough into 1-inch balls. Roll in sugar and place on baking sheets. These will spread and crinkle as they bake. Bake for 12-14 minutes, until cookies are crackly and lightly browned on the edges. Cool briefly on cookie sheets before transferring to a rack to cool completely.