Preheat your oven to 350°F (175°C). Liberally grease and flour both halves of your lamb mold.
In a stand mixer, combine the cake mix, FitFlour, eggs, applesauce, water, and oil.
Mix on medium speed for 2 minutes until the batter is smooth and well-incorporated.
Pour the batter into the face-side of the mold, ensuring it fills all crevices. Secure the back half of the mold tightly.
Place the mold on a baking sheet and bake for 50 minutes.
Allow the cake to cool completely in the mold before removing. Finish with a dusting of powdered sugar.