I make something similar…but don’t add powdered protein. I freeze a banana, cut up (actually, about 5 bananas at a time). After frozen, put banana (s) in blender, and for each banana add about 1 T. cocoa or cacao powder, and a big serving spoon of peanut butter (organic, and possibly any nut butter you have will work). Blend in food processor and serve as soft-serve right away. We have also frozen it, but it freezes harder than dairy…so you have to let it thaw a bit.
Your recipe encourages me to branch out a bit–adding cacao nibs or some nuts to compliment the nut butter. Possibly, too, the addition of a nut milk may make it smoother. Thanks so much–excited to try this!