Take a banana in a bowl. Prefer ripe to over ripe banana.
Mash it well.
Add wheat flour, rice flour, jaggery and fennel seeds.
Add water little by water to make a batter. The consistency of batter should be thick but flowing.
Put the batter at rest for about 10 minutes.
Add baking soda and mix it well.
Grease appe pan (see notes below if you don't have this pan) with oil and pour batter in every cavity little by little with spoon. Don't fill till the top because batter will rise while cooking and ooze out of the cavity.
Cover the pan and let it cook for 3-4 minutes on low flame. However they will be cooked uncovered too but covering them will reduce the cooking time.
Uncover and turn the sides of banana appe so that they get cooked from other side too.
Once they turn golden brown from both the sides, take them out.
Banana appe are ready. Enjoy.