Prep: Place the plastic shot cups on a rimmed tray or in a baking dish so that they will be easy to transfer to and from the refrigerator. Also, make sure that you have space in your refrigerator to place them set.

Green layer: In a large bowl or measuring cup with a spout combine the lime jello mix and 1 cup of boiling water. Whisk until the jello is fully dissolved, about 2 minutes. Whisk in ½ cup of cold water and ½ cup of vodka. Carefully pour the jello mixture into the cups, filling them each a little less than halfway. Place the shots in the refrigerator to chill until the jello has set, about 45 minutes

Red layer: Repeat the process, whisking the cranberry jello mix with 1 cup of boiling water until dissolved, then mixing in ½ cup of cold water and ½ cup of vodka. Carefully pour the red liquid on top of the green layer. Chill in the refrigerator until fully set (at least 2 hours, overnight works too).

Serve: When ready to serve, top with whipped cream and festive sprinkles.