Add 2+ 1/2 Cups of Water to a Pot. Bring it to a boil.
Add in lightly crushed cumin and carom seeds, along with salt and baking soda. Let it boil for a minute.
Now add in the crushed green chilies. bring it to a boil for another 2 minutes.
Now keep a spatula, preferably a wooden spoon.
Quickly add the rice flour, and mix it using the wooden spatula. make sure everything is mixed well properly. If you still see flour, add tiny amounts of water as required until you don't see white flour anymore. Make sure your khichu doesn't become soggy.
Turn off the stove immediately once mixed well. Take the khichu out in a wide big bowl so that it cools a little bit