Boil the sweet potatoes until soft, and remove the skin.
Heat the oven to 180 C degrees.
Mash the boiled sweet potatoes, and mix with soy milk until smooth.
Blend banana, coconut oil, and vanilla into the sweet potato mixture.
In a separate bowl, mix the agar agar with 1/2 cup boiling water. Set aside for 10 minutes, add to mixture.
Add flour, sugar, baking powder, and a dash of cinnamon.
Blend well, and refrigerate for 15 minutes.
Pour the mixture into an oven-proof bowl and bake it in the oven for 20 minutes or until slightly brown.
Let it cool down before slicing it into squares and serving.
Optional: Serve with vegan whipped cream.

2 medium sweet potatoes
1 large banana
1/2 cup flour of choice
1/4 cup coconut oil
1/2 cup sugar/sweetener of choice (like stevia)
1 teaspoon vanilla essence
1/2 teaspoon agar agar
1/2 baking powder
1/4 cup soy milk
cinnamon