Cream butter and brown sugar until light. Beat in molasses and egg.
In another bowl, whisk together remaining ingredients (except frosting).
Gradually beat creamed mixture.
Shape dough into a disk (you can cut the dough into two disks to make them easier to work with), and refrigerate until easy to handle – about 30 minutes.
Preheat oven to 350º.
On a lightly floured surface, roll dough to about 1/8 inch thickness.
Cut with a floured gingerbread man cookie cutter.
Place on cookie sheet about an inch apart
Bake for 8-10 minutes until edges are firm.
Remove from cookie sheets and cool on wire racks.
Once cookies are completely cool, frost as desired.