Cooking time varies from oven to oven.
I have used a bread tin you can used a 8 inch round pan too.
If you are having small banana's then use 4 and bake.
Add moderate spice powder as given otherwise their flavour will be over powering.
I have used only wheat flour but you can use combination of all-purpose flour and wheat flour.
You can use any type oil for this even olive oil.