In a chilled bowl, begin whipping cream on low speed until frothy.

Increase speed to medium and beat until the cream has increased in volume and starts to resemble soft clouds. Add sweetener and mix in well.

Add vanilla and continue to beat.

When you can see trails in the cream left by the beaters, you are almost at the endpoint. Soft peaks are formed when the cream folds upon itself. Another few seconds will yield firmer peaks.