Pre-heat oven to 180 degrees celsius and line a square cake tin with baking paper.
In a food processor, blend together the sweet potato and milk until combined.
1.5 cups sweet potato steamed, 1 cup almond milk
Add the rest of the ingredients one at a time and process until smooth, scraping down the sides with a spatula when needed.
1/3 cup coconut sugar, 1/2 cup cocao powder, 1/2 cup brown rice flour, 40 g vanilla protein powder, 1/4 cup almond meal, 1 teaspoon baking powder
Transfer mixture to the cake tin and pat down with a spatula. Bake for 25-30 minutes or until a skewer is inserted and comes out clean.
Let it cool on a wire wrack before icing and eating.