Melt butter in a sauce pan over low heat. Stir in brown sugar, molasses, spices, and salt until fully blended together. Remove from heat and transfer to a large mixing bowl. Let sit until cool. Once cooled whisk egg into butter-sugar-spice mixture. Set aside.

In a medium mixing bowl, whisk together flour, baking powder and baking soda. Pour flour mixture into butter-sugar-spice mixture. Gently stir until combined. The dough will be very sticky at this point. Refrigerate dough for at least 45 minutes to allow it to firm up.

Once dough has refrigerated, preheat oven to 350 degrees.

Roll dough into 2 tablespoon balls. Roll dough balls in sugar to coat (optional). Arrange on a cookie sheet at least 2 inches apart. Bake until just set, about 10-12 minutes. Let cookies sit on cookie sheet for 5 minutes. Enjoy!