Beat egg yolks and 2/3 of the confectioners' sugar together in a bowl until smooth; add vanilla extract, cinnamon, cloves, salt, allspice, and baking soda and beat until smooth.
Beat egg whites in a bowl using an electric mixer until frothy; add the remaining confectioners' sugar and beat until stiff peaks form. Fold egg white mixture into egg yolk mixture. Refrigerate or freeze mixture until chilled, at least 1 hour.
Spoon 2 tablespoons mixture into each mug; top each with 1 shot brandy and 1 shot rum. Fill the rest of each mug with boiling water; stir and top with nutmeg.
This recipe contains raw eggs. We recommend that pregnant women, young children, the elderly, and the infirm do not consume raw eggs. Learn more about egg safety from our article, Making Your Eggs Safe.
Per Serving: 257 calories;2.7 g fat;
23 g carbohydrates;
2.7 g protein;
123 mg cholesterol;
98 mg sodium.