In bowl mix flour, ginger, cinnamon, baking soda, nutmeg and salt. In an electric mixer combine butter and brown sugar on medium speed until fluffy. Add molasses, egg and vanilla; mix well. Slowly add in flour mixture on low speed until well mixed. Wrap dough in plastic wrap. Refrigerate overnight.
The next day: Preheat oven to 350 degrees. Roll dough to a 1/4 inch thickness on a floured work surface. Cut into gingerbread men shapes with cookie cutter. Place about a finger tip apart on ungreased baking sheets. Bake 9 to 12 minutes or until edges of cookies are set and just begin to brown. Cool on baking sheets 2 minutes. Remove to wire racks; cool completely. Decorate cooled cookies.
Notes
I use the white, green, & red icing from Betty Crocker just because it is so convenient but you can make your own too. Refrigerate dough overnight.