Crush one gingerbread cookie into crumbs.
Moisten the rim of the glass with a bit of eggnog, then dip the glass into the crushed cookies.
Add ice to a cocktail shaker.
Add in the spiced rum and brandy into the shaker.
Pour in the eggnog as well.
Shake it up until well combined and very cold. Pour all the ingredients into the rimmed glass.
Serve and enjoy!