Heat oven to 350 degrees. Mix melted butter, sugar and molasses together in a large bowl. Add egg and mix to combine.
Sift flour and spices together in a separate bowl. Add the dry ingredients to the wet ingredients and mix just until blended. Chill dough 1 hour or more.
Roll into 1 1/2″ balls. Dip half of the dough balls into the crystalized sugar, and place the dough balls sugar-side-up on a baking sheet, allowing plenty of room for the cookies to spread. Bake 10-12 minutes, removing cookies when they are still soft. Cool on cookie sheets. If not serving immediately, store cooled cookies in an airtight container.