Combine the milk, protein powder, sugar-free vanilla pudding mix, vanilla extract, butter extract, stevia, and salt in a blender. Blend until everything is smooth and well combined.
Pour the blended mixture into your Ninja Creami pint. Place the lid on securely and freeze it on a flat surface for 24 hours.
Remove the pint from the freezer and run it under hot water for 1-2 minutes.
Spin on Lite Ice Cream mode.
Re-spin it 1-2 times until you achieve your desired consistency.
If there isn’t already a well in the center of your ice cream, create one with the back of a spoon. Add the mini marshmallows and Rice Krispie cereal to the well. Spin on the Mix-In setting.
Top your ice cream with a sprinkle of cereal or a few extra marshmallows if you'd like and enjoy!
