We've seen lots of versions of this recipe from different training programs. Stevia-sweetened dark chocolate chips, like Lilys, make it possible. All Lilys chocolates are not great choices, but the dark chocolate baking chips are a staple around here. Walden Farms caramel sauce on top raises this from tasty to, 'Oh my heavens!' We used whey protein, but you can sub your favorite kind, including caesin, which is said to break down a bit better overnight. In any case, delish!