In a large mixing bowl sieve chickpea flour, all-purpose flour, semolina, and baking powder together and mix well. Add zucchini, coriander leaves, green chillis, yogurt, water, salt, and black pepper. Mix everything until well combined.
The batter will be as thick as the pancake batter. If it is too thick, add water as necessary.
Heat 1 teaspoon oil in a large non-stick pan or skillet on medium-high heat. Pour ⅓ cup of batter and spread lightly to form a thick and round pancake.
Let it cook on medium heat until light golden brown for about 2-3 minutes. Then flip carefully with a spatula and cook another side for 2-3 minutes.
Continue making pancakes until all the batter is used.
Spread some butter on pancakes if desired and serve immediately with yogurt, ketchup, or with your choice of chutney.