In a large bowl add the Besan/Chickpea flour, Rice flour, chilli powder, chaat masala powder, amchoor powder, hing, baking soda and salt to taste
Mix all the above ingredients well before adding the grated potatoes. Now add the grated potatoes to the mix
Make sure that the potatoes are grated well without ant big pieces. If there are lumps it will clog the sev presser
Now mix everything with your hands until it comes together to form a dough. Do not add any water at this point and let the moisture from the potatoes to help with the dough.
Now if the mixture is not formed into a dough and needs water add 2 or 3 tbsp of water 1 tbs at a time till the dough is formed.
This dough is a bit sticky compared to other doughs and it is normal. Just add some oil and roll the dough to a ball and let it sit.