Preheat the oven at 180c.
Line a preferably square baking tin with baking sheet or grease the tin well with some butter.
Peel and chop the sweet potato into small pieces.
Take them in a pan. Add some water and cook till soft.
Allow it to cool and mash it to a smooth paste.
Chop the chocolate into tiny pieces.
Grind the oats flakes to a fine powder.
Take the oats flour in a mixing bowl.
Add the cocoa powder and baking powder.
Add the mashed sweet potato and chocolates. Mix.
Add the Oil and milk and mix well with a spatula.
Add some sugar and mix everything well together.
Pour the batter in the prepared cake tin.
Bake at 180c for 30-35 minutes. Check if the cake is done by inserting a skewer or knife in the center.
Allow the cake to cool and slice them to desired shapes or into squares.
I usually place the remaining cake in a airtight container and place it in the refrigerator.