Line an 8" brownie pan with parchment paper both ways.
In a large bowl, add the rice krispies and salt.
In a large microwave-safe bowl, add the date syrup and nut butter. Microwave for 20 seconds, or until softened and slightly warm.
Stir in the cinnamon and sweetener, then stir in the protein powder. Dump in the rice krispies and fold together.
Scoop the mixture into the prepared pan and flatten. Cover and refrigerate overnight. Slice and serve!