A 4-ingredient recipe for protein butter using Cinnamon Toast Crunch cereal and protein powder.
Add all the ingredients to a food processor, starting with four tablespoons (56g) butter. Depending on the protein powder you use, you may not need the full amount.
Pulse until everything is mixed evenly. The image for this step is a great example of needing more butter. Add the fifth tablespoon of butter and blend again.
The protein butter should be smooth and easily spreadable. Refrigerate leftovers and briefly thaw before using.