Preheat oven to 375F. Line 2-3 metal baking sheets with parchment paper and set aside.
In a large bowl, cream brown sugar and butter just until smooth. Add the egg and mix until combined. Add vanilla extract and molasses and mix well.
In a second bowl, stir together flour, salt, and spices.
Add dry ingredients to wet in 2-3 additions while mixing on low. Stop mixing as soon as dough comes together.
Scrape dough out onto a well-floured surface. Flour a rolling pin and roll dough out to ¼-inch thickness. Cut shapes as desired, gathering and re-rolling dough scraps as needed. Place shapes onto prepared baking sheets with 2 inches of space between each one.
Bake 8-9 minutes or until set. Let cool 5 minutes on baking sheet, then transfer to cooling rack to finish cooling. Serve as is or decorate as desired.
