Whisk together flour, spices, baking soda, and salt.
Beat butter and brown sugar for 2 to 3 minutes until fluffy.
Add molasses, egg, and vanilla. Beat until smooth.
Gradually add flour mixture. Mix on low until combined.
Divide dough in half. Flatten into discs.
Wrap in plastic wrap. Refrigerate at least 2 hours.
Preheat oven to 350°F (175°C). Line baking sheets with parchment.
Roll dough to ¼ inch thick on floured surface.
Cut with cookie cutters. Place on baking sheets.
Bake 8 to 10 minutes until edges are firm.
Cool on pan 5 minutes then transfer to wire rack.
Cool completely before decorating.