Take the butter out of the refrigerator and let it warm up to room temperature.
Preheat the oven to 320 degrees Fahrenheit (160 degrees Celsius).
Cover a baking sheet with baking paper.
Weigh all the ingredients for the cookie dough.
Tombstone gingerbread cookies
Beat the butter with the sugar until it is soft and creamy (2 minutes).
Stir in the flour and gingerbread spices and mix for 1 minute.
Wrap the dough in plastic foil and let it rest for 30 minutes in the fridge (that way the dough will stick less).
Roll out the dough to a thickness of approximately ¼ inch (0.5 cm) and use a tombstone cookie cutter to cut out shapes from the dough. If you don't have one, cut the shapes out of the dough with a sharp knife. Make a text on the tombstone with a satay stick, such as R.I.P.
Put the cookies on the baking tray.
Bake the cookies in the oven for 12 minutes.
Allow to cool on a rack.
Divide the chocolate mousse into 4 glasses.
Top the mousse with chocolate sprinkles
Take the zombie hand and stick it in the middle into the mousse.
Add the tombstone cookie on the back of the glass.