This is my usual version. It calls for two cups of chocolate milk or vanilla, two tablespoons of stevia or any sweetener you like, two tablespoons of sugar-free chocolate pudding mix, one tablespoon of cocoa powder, and whipped cream on top if you want it.
You can pour a protein shake into the ninja creami and get something close to ice cream, which I do from time to time. Still, I really dislike sucralose and try to avoid loads of sugar, so I usually go with an allulose and monkfruit mix instead. Last night I put together one pint with twenty grams of macadamia nuts blended into a little water first. No straining required because the machine will break them down. I also added a spoonful of cocoa powder, a spoonful of the allulose monkfruit sweetener, thirty grams of protein powder, a touch of vanilla extract, a little grated tonka bean, one tablespoon of pistachio instant pudding mix to improve the texture and add pistachio flavor, and a pinch of salt. The end result tasted exactly like chocolate pistachio ice cream.