First, take one cup of gram flour in a mixing bowl. Add spices: 1/8 tsp turmeric powder, 1/4 tsp coriander powder, 1/4 tsp fennel seeds powder, 1/8 tsp grama masala powder, 1/2 tsp salt or as needed
Then add 1 to 1.5 cups of water to it.
Mix all of these ingredients well with a spoon.
After that, add vegetables: chopped onion, tomato, green chili, and coriander leaves.
Mix them well. The batter should not be very thin or thick. It should be a normal, smooth batter.
Heat a tawa/griddle on medium heat. Spread some oil on the griddle.
After that, take some batter with the spoon.
Pour the batter in the middle of the griddle in a round shape.
Then spread the batter with a spoon in a circle. When you spread the batter on the griddle, the flame should be a low. Then, cook it on medium heat for few minutes and pour oil all around its edges.
When the chilla is roasted on one side, then flip it carefully with a spatula to another side. Drizzle some oil on it and its edges.
Then flip it again with a spatula and cook the other side. Press gently on it and its edges so that they cook properly until it has a golden texture.
When the golden texture comes on chilla then remove it, or you can transfer it directly into the plate.