Peel the bananas and mash it with a fork.
Add oil and curd. Before adding curd beat it.
Mix all the ingredients well.
Now add cardamom powder, cinnamon powder, baking powder and vanilla essence.
Add egg and mix it well.
Add sugar and mix till sugar gets dissolved fully.
Sieve wheat flour and add to the batter in small proportion and fold it.
Don't over mix or beat it. Or else the cake will become hard.
Take walnuts mixed with plain flour and fold it into the batter.
Pour the batter into the baking pan lined with oil paper. If you want top it with sliced bananas.
Bake in convection mode 180 c for 30 minutes