I just made these! I used regular peanut butter and then a scoop of vanilla and a scoop of chocolate whey protein powder. The powder is definitely very visible in the bars themselves, but it all tastes delicious. A little crumbly too, and be cautious when heating up the coconut oil, rice syrup, and peanut butter that you stir constantly to else it WILL burn!
They're not the treats that you can pull apart and see the gooey marshmallow, but they are still ridiculously delicious!