Sweet Potato Chocolate Cake

I always wondered why people add lot more sweet to vegetables; pull out all the natural flavour to make it a sweet dish.. for example zucchini cake.. I haven't got the mood to try it yet..Then I came across this recipe.. Sweet potatoes are sweeter side.. So this should be good to try... The cake came out good and tastes good too... but was a little lesser on the sweeter side... I don't remember any sweet potato flavour in the cake..It was just a variation to the chocolate cake...

INGREDIENTS:
Makes about: 8 pieces
3/4 cup Sugar
1/2 cup Curd
1/2 cup Oil
1 teaspoon Vanilla extract
1/2 cup Sweet potato (Boiled and mashed)

1 1/2 cup All purpose flour
1/2 cup Cocoa powder
2 tablespoons Corn flour
1 teaspoon Baking powder
1/2 teaspoon Baking soda
1/4 teaspoon Salt

PROCEDURE:
1. Preheat the oven to 350F
2. Dry ingredients mixture:
Sieve together flour, cocoa powder, corn flour, baking soda, baking powder and salt together.
3. Wet ingredients mixture:
In a bowl whisk sugar, curd, oil and mashed sweet potato together till well blended. Add Vanilla extract.
4. Add the dry ingredients to the wet ingredients in batches and stir.
5. Spread the batter evenly in the prepared tin and bake it for 30 minutes. A skewer inserted in the middle of the cake will come out clean.
6. Let it cool down completely before slicing.

NOTES:
1. The original recipe is here - Priya's Versatile Recipes
2. Stir in chocolate chips or chopped chocolates for more chocolaty taste.