This moist, protein filled carrot cake will blow your mind. It is difficult to argue with the convenience of boxed cake mixes. And, with a few minor adaptations, you can have the convenience of a boxed cake with the presentation and taste of a cake made from scratch. Most boxed cakes call the addition of oil, water and eggs, but we will also add extra protein and fibre to this delicious cake. You can use any other cake mix that you like, just add extra water due to protein powders used.