Sounds like "Eggnog" to me. You could try adding finely grated orange zest and a split vanilla bean to the dry ingredients...allow flavors to blend in an air tight container for a week or so. Then add your boiling hot water to a warmed mug with heaping tablespoon or two of the mix, a jigger of rum (adding a jigger of Grand Mariner will intensify the orange flavor) and a pat of butter...decorate with a cinnamon stick as a stirrer and enjoy a toasty treat to warm your winter bones! **Using the different flavors that rum comes in today will add many variations to your drink profile.
This is the stuff of legends, but I can't help but laugh at the description: "Bring it out for parties, or whenever the temperature drops below 25 degrees." I live in Minneapolis. There are entire months were the temp doesn't peak above zero.