Preheat oven to 175°C.
In a bowl whisk together butter, banana and sugar.
Add in milk and vanilla essence and mix well.
Sift together wheat flour, corn flour, baking powder and baking soda.
Add it to the butter mix and gently mix to form a thick batter.
In a separate bowl mix together oats, butter, cinnamon and sugar until crumbly.
Grease, and line a 7" round tin and pour the batter into the tin.
Now top the batter with the crumb topping evenly.
Sprinkle choco chips and peanuts on top.
Bake for 30 - 35 minutes in the preheated oven.
Remove from oven and allow it to cool a bit in the pan.
Flip it onto a plate, remove the lining paper and flip it back on to the wire rack and allow it to cool completely before slicing.