Line an 8 x 8 inch baking pan with tin foil and set aside.
In a large mixing bowl, combine your flours, protein powder, cinnamon and granulated sweetener and set aside.
In a microwave safe bowl or stovetop, melt your cashew butter with the sticky sweetener of choice. Whisk in the vanilla extract and optional butter extract and pour into the dry mixture. Mix very well until fully incorporated. Using a tablespoon, add milk of choice until a very thick batter is formed.
Pour batter in the lined baking pan and press firmly in place. Sprinkle with the 1/2 teaspoon of granulated sweetener and optional sprinkles and refrigerate for at least 10 minutes, or until firm. Once firm, add frosting of choice and refrigerate for another 30 minutes to firm up before slicing.
To make frosting(s)
Combine all ingredients and use milk of choice to thin out until a very thick frosting is formed.
No bake sugar cookie bars should be kept refrigerated but can be frozen too.These would be perfect to wrap individually and gift to others for a healthy holiday treat!