Wash the green lentils in clean water, then soak them for 3 to 4 hours.
After 4 hours, drain the water from the soaked lentils.
Now, add the soaked moong dal to a blender jar with chopped green chilli, ginger, and 1 tbsp water.
Blend all the ingredients until you have a smooth paste, not too thin or too thick.
When the paste is ready, transfer it to a mixing bowl.
Add spices, coriander powder, cumin powder, chaat masala, and salt.
Now add onion and tomatoes to it.
Mix all the ingredients well, and the batter is ready.
Heat the tawa on a medium flame.
When it gets heated, drizzle some oil and pour a scoopful of batter in the middle of the tawa.
Now spread the batter on the tawa in a circular direction.
Drizzle some oil all over its edges and flip it with a spatula after a minute.
Again, drizzle some oil on this side too and cook until golden flakes come.
When the chilla gets the golden flakes, remove it.
Serve it with green chutney or a cup of tea.