Grate the bottle gourd using the fine side of your grater. Do not squeeze out the water from the grated lauki—that water is packed with nutrients and will help form our batter!
In a large mixing bowl, combine the jowar flour, carom seeds, cumin powder, turmeric, hing, and salt.
Fold in the grated bottle gourd, chopped moringa leaves, onions, and coriander. Mix well. Use your hands to mix everything well, squeezing the onions and carrots slightly so they release their natural moisture. The liquid from the bottle gourd will start to wet the flour. Do not add water.
Grease a piece of parchment paper, butter paper, or a clean banana leaf with oil. Pat the dough ball into a thin circle on the paper.
Heat your tawa on medium-high. Carefully lift the paper/leaf, flip it over onto the hot tawa (dough side down), and gently peel the paper away. Cover and cook both sides with oil or ghee until crisp and golden.
Gently flip the chilla using a spatula. Press down lightly and cook the other side for another 1-2 minutes until beautifully golden spots appear.
Serve jowar ka chilla warm with chutney, pickle, or raita.