Take maida in a mixing bowl and mix water little by little without forming any lumps until you get the consistency of normal dosa batter. If required use your hands to mix the batter.
Add salt, chopped onions and chopped green chillies and combine well.
Heat a non stick pan on medium high flame, grease it with cooking oil.
Reduce the flame to medium.
Using a ladle or a cup, pour the batter starting from the outer edge of the pan, covering the entire circumference in the form of a circle. Fill the gaps in between, quickly and evenly.
If needed, pour a tsp of oil or two on and around the dosa.
Let cook for a minute and when it turns to golden color flip over.
Cook for few more seconds and serve with any chutney, Dosa podi or Sambar.