Take powdered oats, besan, spices, vegetables, salt, cooking soda and other ingredients in a mixing bowl.
¼ tsp Red chilli powder, ¼ tsp Roasted cumin seeds powder, ⅛ tsp Turmeric, ⅛ tsp Black pepper powder, ⅛ tsp Asafoetida
Then, mix roughly before adding water.
After that, add 1 cup water and mix to make thick batter.
Once you mix well without lumps, add ½ cup water little by little to make batter.
Now, set this aside for 10 minutes for resting.
After that, add more water, ¼ cup approx to loosen the batter. Consistency like idli dosa batter.