Gather quinoa, urad dal, chana dal and fenugreek seeds to a bowl. Add water to immerse the ingredients. Soak for 4-6 hours.
Wash and rinse soaked ingredients and transfer to a blender jar. Add salt, baking powder, flax seeds and half cup water. Blend for a minute and add rest of the water. Blend to fine batter and transfer to a glass container. Batter is ready.
When you're ready to cook the dosa, add desired quantity of batter (about 4 tablespoons per dosa) to a bowl, add yogurt, water (just enough to get the right consistency), and mix well.
In the meantime set pan on stovetop and set it on medium heat. Once the pan is hot, pour batter and spread evenly with the back of a ladle. Add a few drops of oil and ensure it is evenly spread. Cook for 2 to 3 minutes, flip over and cook for a minute.