Sweet Potato Brownies

200g mashed sweet potato (orange)
200g black chocolate
100g butter
100g flour
125g sugar
2 eggs
1/2 tsp cinnamon powder
1/4 tsp nutmeg powder
50g chopped walnuts
1/4 tsp baking powder
Steam cook sweet potato & mash it.
Add spices (cinnamon powder, nutmeg powder).
Mix well & keep aside.
Break the chocolate bar & add 2 tbsp water.
Melt in microwave oven 2 mn.
Add butter & mix well.
In another bowl beat eggs & sugar.
Add chocolate butter mixture to the mashed potato .
Mix well & add chopped nuts.
Sieve the flour & baking powder together & fold into the cake mixture.
Pour the batter into the greased cake pan (rectangular).
Preheat oven to -Th 180°C & bake for 20mn.
Cool, cut in squares & serve with tea.