Preheat oven to 350 degrees F.Sift together flour, baking soda, spices and salt into a medium bowl. Combine the butter, brown sugar and molasses in a large bowl with a wooden spoon.Add the flour mixture and stir until incorporated. Form the dough into a flat rectangle and wrap in plastic. Refrigerate for 30 minutes.Line a baking sheet with parchment paper.Cut dough in half so it is easier to roll.On a lightly floured surface, roll it out 1/4-inch thick.Using a 2 or 3-inch cookie cutter, cut out as many cookies as you can.Place them on a parchment-lined baking sheet and repeat with the remaining dough. Bake them until crisp and golden brown, about 8 to 10 minutes. Let cool