Combine all ingredients in a martini shaker or a pitcher. Taste for spiciness and adjust by adding a little cinnamon schnapps or heavy cream, as needed. Refrigerate.
To decorate the rims, dip edge lightly into the frosting or marshmallow fluff, then into sprinkles. You just need enough frosting to get the sprinkles adhere, not to get a big lump on the rim.
When ready, pour the cocktail into shot or martini glasses and serve. Cheers!
Notes
~ Free Tip ~
Serving a crowd? Measure the ingredients in parts: one part vodka, rum, and heavy cream; ½ part Crème de Cacao. Best made ahead of time.