Line a 8×8 or 9×9 square pan with parchment paper, leaving extra on the sides.
In a large bowl, combine cereal and protein powder. Add in brown rice syrup and nut or seed butter and mix until everything is full incorporated. Press mixture into prepared pan, working into all four corners.
Place pan in fridge and allow bars to set for about 20 minutes. Cut bars into 16 squares and top with chocolate if using. Enjoy!
*You can sub whey protein powder with chocolate vegan protein and add 1 TBS of instant coffee powder to make vegan. Or a mocha vegan protein powder.
-Bars will keep best in fridge but can be enjoyed at room temperature.