Wash and soak Chana dal in water for 3-4 hours.

Rinse and drain the soaked dal.

Preheat oven to 200 degree Celsius.

In a blender or food processor, combine chana dal, fennel seeds, cumin seeds, green chillies, curry leaves, fresh coriander, ginger, garlic cloves, and salt.

Grind to a coarse mixture, adding water only if necessary.

Transfer the mixture to a mixing bowl.

Add chopped onion and baking soda.

Apply oil on your palms.

Shape the mixture into 2-3 inch flat discs.

Place the vadas on a baking tray lined with parchment paper.

Bake for 18-20 minutes, or until golden brown.

Remove from oven and let cool slightly.

Serve warm with mint chutney and Khajur Imli Chutney.