Add the cream cheese to a bowl and whip with your beaters until softened. This should take 20-30 seconds.
Add the erythritol to combine.
Pour in the heavy cream in 4-5 batches. This is so that the cream doesn't splatter everywhere.
Beat for a few minutes, until the frosting starts to thicken up.
Once it's thickened up, add the stevia and vanilla to the frosting and mix to combine.