Thoroughly whisk together the chocolate protein shake, powdered peanut butter, optional chocolate instant pudding mix, and optional cocoa powder.

Pour the whisked mixture into a Ninja Creami pint container. Place the lid on the container and freeze it for 24 hours.

Once frozen and ready to turn it into ice cream, remove the container from the freezer and let it sit at room temperature for about 10 minutes. Remove the lid of the container and if there is a peak, use a spoon to scrape it off so there is a smooth surface.

Secure the container in the Ninja Creami machine. Then, press the Lite Ice Cream button. After the first spin, the mixture may be powdery, so as an option, add a splash of your milk of choice. Then, spin again on Lite Ice Cream. After two spins, the mixture should be creamy and thick, if not, spin it again.

You can use the mix-in feature to mix in mini chocolate peanut butter cups, or add them on top and serve.