Melt the butter on low flame in a saucepan. Simmer till the butter turns brown and aromatic. It will look and smell like caramel. Switch off and allow to cool completely.
Meanwhile, prepare the caramelized banana by melting the butter in a saucepan. Spread on the pan, arrange the banana and sprinkle the sugar over it. Flip and cook both sides till caramelized. Switch off and allow to cool.
Preheat oven to 180 degrees. Keep a large loaf pan greased and floured aside.
In a large bowl, sift together the flour, baking powder, soda and salt. Set aside.
In another bowl, beat together the browned butter, oil, sugar, eggs, banana and vanilla till nicely combined.
Add in the dry ingredients and beat just till combined. Do not overmix.
Pour into prepared pan. Arrange the caramelized banana on top and scrap any caramel remainings on to the cake.
Bake for around 50-60 minutes or till the skewer comes out clean. If the top is getting burned, cover with a foil after 40 minutes on the top and continue to bake.
Once done, allow it to cool in the pan for five minutes. It will detach from the sides. Slowly flip on to a cooling rack, arrange the banana side up and cool completely.
Slice and enjoy with a cup of coffee or tea!
Notes
The caramelized banana topping is purely optional. You can skip this step.