Dissolve sugar-free gelatin completely in boiling water, stirring until no granules remain
Add cold water to the gelatin mixture and stir to combine
Allow mixture to cool to room temperature without fully setting
In a separate bowl, whip heavy cream until soft peaks form
Add powdered sweetener and vanilla extract while whipping
Continue whipping until cream reaches a fluffy, stable consistency
Slowly pour cooled gelatin mixture into whipped cream
Gently fold until fully incorporated and smooth
Spoon mixture into serving cups or dessert glasses
Refrigerate until fully set and firm
Serve chilled for best texture and flavor