Add mashed bananas, sugar, oil and milk in a big bowl.
Whisk them well so that sugar dissolves completely.
Place a sieve over the bowl.
Add wheat flour, corn flour, cocoa powder, baking soda, baking powder and salt.
Sift the ingredients into the bowl.
Before mixing the ingredients, add raisins and half of the almonds, walnuts and chocolate chips.
Also add the vanilla essence.
Give it a mix using cut and fold method.
Transfer the batter in a greased baking tin.
Top the batter with remaining almonds, walnuts and chocolate chips and tap the cake tin twice.
Bake in a preheated oven @170°C for 40 to 45 minutes in the middle rack with both the rods on.
Once the time is over, check the cake using a toothpick. If the toothpick comes out clean, this is a sign that cake is perfectly baked.
Let cake cool down completely before inverting and slicing.
Enjoy.