The bowl and beaters should be chilled to 40F, perfectly clean, and bone dry.
The heavy whipping cream should also start off at 40F.
Start whipping up the cream on low speed, until you see the cream starting to increase in volume.
Add everything else in order everything other than the vodka and flavouring in the metal mixing bowl, and keep whipping.
When everything is incorporated, add the vodka and flavouring.
Keep beating until soft peaks form, and the volume of the mixture has increased by at least 50%
Transfer to freezer-safe container, pop in the freezer, and wait at least 4 hours before serving.