Combine besan, suji and salt in a bowl.
Gradually add water. Make a smooth and lump-free batter.
Add all the chopped vegetables. Give it a nice mix. Allow it to rest for 15 minutes.
Heat a non-stick pan on medium heat. Add a tbsp oil. Pour a ladleful of batter and spread it out evenly in a circular shape. Continue to cook on low flame till the base becomes golden.
Flip and cook the other side as well. Make the rest of the chillas in a similar manner.
Serve the besan chilla or cheela with tomato ketchup and a cup of chai.