Preheat oven to 180° C for 10 minutes with both rods on. Grease cake tin and line with parchment paper.
Coat the chocolate chunks and walnuts with little flour. Keep aside.
50 Grams Dark chocolate chunks, 50 Grams Walnut
In a mixing bowl add in the milk and vinegar. Mix well and keep aside for 5 minutes. (Your buttermilk is ready).
150 ml Whole milk , 2 Teaspoon Vinegar or lemon juice
Add in the mashed banana, oil, brown sugar and vanilla extract. Mix well until well combined.
150 Grams Mash ripe banana , 150 Grams Brown sugar , 90 ml Oil, 1 Teaspoon Vanilla extract
Seive in the flour, cocoa powder, baking powder, baking soda and salt. Sift them together.
1½ cup Whole wheat flour , 30 Grams Cocoa powder , 1½ Teaspoon Baking powder , 1 Teaspoon Baking soda , ¼ Teaspoon Salt
Gently fold the mixture and make a smooth lumps free batter.
Add in the flour coated chocolate chunks and walnuts. Gently give a quick mix. Do not overmix at this stage.
Pour the batter onto the prepared pan and tap the pan to release any air bubbles trap inside.
Sprinkle the chocolate chunks and chopped walnuts all over the cake.
20 Grams Dark chocolate chunks, 20 Grams Walnut
Bake the cake at a preheated oven @180° C for 35 to 40 minutes or until a toothpick inserted comes out clean.
Remove the cake from the oven and allow to stand for 5 minutes.
Demould the cake from the pan and allow the cake to cool down completely.Slice and enjoy!