Preheat oven to 180 degrees. Grease and flour a springfoam pan well.

Separate the eggs. Whisk the whites till stiff peak. Set aside.

Add the soft butter and sugar into the egg yolks and beat till soft and fluffy.

Sift in the dry ingredients into the beaten mixture, add the milk and briefly beat till well blended. Do not overbeat.

Using a spatula, fold in the egg whites into the batter till well incorporated.

Pour the batter into the prepared tin. Spread the sliced banana on top.

To make the crumble, add all ingredients into a bowl and rub with your hands to make it all moist. Sprinkle on top of the cake.

Bake for 50 minutes to an hour till a skewer comes out clean. Cool in pan for sometime. Enjoy warm or at room temperature, as per your wish!