Preheat oven to 180 degrees C. Line pan with aluminum foil. Place sweet potato on baking sheet and poke sides with a fork. Cook sweet potato for 30 minutes in oven. Flip and cook remaining 30 minutes.
Let sweet potato cool and then peel. Transfer to a small bowl and mash with a fork or potato masher. Add butter or the coconut oil or butter to potato whilst still warm. Then add the remaining ingredients. Fold in the nuts if using.
Transfer the brownie dough to a greased 20 cm square cake tin and top with the chocolate.
Bake at 180 Celsius/350 Fahrenheit for 20-25 minutes until the mixture starts to set. Cool for 30 minutes before cutting into squares and serving.
Recipe Note
Sweet Life Asia https://sweetlife.asia/blogs/recipes
