Real whole whipping cream and sucralose. Better yet, I have a granular sucralose with erythritol that is nearly the taste of actual sugar, I get if from Amazon:

https://www.amazon.com/gp/product/B...ge?ie=UTF8&th=1

The granular will not dissolve well in cold liquids, the pure sucralose I use is liquid and will dissolve in anything.

I do not like artificial sweeteners generally and can taste them more than most people, so you can take my suggestion as a very discerning consumer. Sucralose and erythritol are the only artificial sweeteners I can enjoy