Quick, easy and tasty, the Protein World Slender Mug Cake Mix allows you to make a microwave mug cake that's less than 145 calories a shot! Gooey in the middle with a cakey outside, you can have your low-sugar, high-protein dessert whilst still staying in a calorie deficit with this cake-in-a-mug recipe. The high protein content will help develop and maintain lean muscle mass whilst keeping you fuller for much longer than the average dessert.