These beauties are less than 250 calories with 16 - 23 grams of protein each, depending whether you choose the sugar free buttercream frosting or the cream cheese protein frosting. (noexcusesnutrition.com)
Here's a recipe for protein Black Forest cake, complete with protein frosting. (blog.nkdnutrition.com)
The drizzle shown in the photos is my Peanut Butter Protein Frosting, which has whey protein (and was not included in the macros). (proteincakery.com)