In the bowl of a stand mixer with paddle attachment, beat the butter for 1 minute on medium speed until smooth and creamy; add the brown sugar and molasses; beat on medium high speed until combined and creamy-looking; scrape down the sides and bottom of the bowl as needed; beat in egg and vanilla on high speed for 2 minutes; scrape down the sides and bottoms of the bowl as needed
In a separate bowl, whisk the flour, baking soda, salt, ginger, cinnamon, allspice, and cloves until combined; on low speed, slowly mix the dry ingredients into the wet ingredients until combined; the cookie dough will be thick
Divide dough in half; wrap each half in plastic wrap; pat down dough to create a disc shape; chill dough for 3 hours or overnight
Preheat oven to 350F; line baking sheets with parchment paper; set aside
Remove one disce of cookie dough; flour a work surface, hands and rolling pin; add more flour when needed so cookie dough won’t stick
Roll out cookie dough 1/4 inch thick; cut into shapes with cookie cutter; place shapes 1 inch apart on baking sheets; re-roll scraps of cookie dough until all the dough is used; repeat with remaining cookie dough disc
Bake cookies for 9-10 minutes; rotate halfway through
Allow cookies to cool for 5 minutes on cookie sheet; transfer to cooling rack then decorate with royal icing once completely cooled