In a medium bowl, combine your flour, ground ginger, cinnamon, baking soda, nutmeg, and allspice. Give it a good whisk and set aside.
Using a stand mixer or a hand mixer in a large bowl, beat the softened butter until it's light and fluffy (about 30 seconds). Add the brown sugar and continue mixing for another minute until well combined.
Pour in the molasses, crack in the egg, and add the vanilla extract. Mix until everything is just incorporated.
Gradually add the whisked dry ingredient mixture to your wet ingredients. Mix on low speed until the flour is just combined and you have a soft dough. Be careful not to overmix!
Cover the dough with plastic wrap and pop it into the refrigerator for 30 minutes. This helps the cookies keep their perfect shape and flavor.
While your dough chills, preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper for easy cleanup.
Use a 1½-tablespoon cookie scoop (or just roll by hand) to form dough balls. Roll each ball generously in the sanding sugar until it's fully coated and sparkling.
Place the sugared dough balls about 2 inches apart on your prepared baking sheet. Bake for 8 to 10 minutes, until the edges look set and the tops are slightly crackly. Remember, they'll firm up as they cool!
Remove the cookies from the oven and let them rest on the baking sheet for about 2 minutes. Then, gently press a Hershey's Hugs Kiss into the center of each warm cookie.
Allow the cookies to cool for another 5 minutes on the baking sheet before transferring them to a wire rack to cool down entirely.