Uncover the rested naan dough and gently punch it down to release any trapped air.
Briefly knead the dough once to smooth it out.
Divide the dough into equal-sized small balls.
Lightly sprinkle onion seeds and fresh coriander leaves onto a clean rolling surface.
Take one dough ball and place it on the prepared rolling surface. Gently press it down to flatten it slightly.
Using a rolling pin, carefully roll out the dough ball into a circle.
Place a generous spoonful of the prepared paneer butter masala filling in the center of the rolled-out naan.
Fold the edges of the naan dough inwards from three sides, bringing them together at the center to form a triangular shape.
Press the edges to ensure the filling is completely enclosed and the naan doesn't open during cooking.
Lightly brush the bottom surface of the stuffed naan with water. This will help it stick to the hot tawa.
Place the water-brushed side of the naan onto a preheated tawa (griddle) over medium-high heat.
Cook for a few seconds (about 30-60 seconds) until the bottom begins to lightly brown.
Carefully flip the tawa upside down, holding it securely over a direct medium flame (gas stove).
Cook the naan directly over the flame, rotating the tawa as needed, until it puffs up and develops golden brown spots. Be cautious not to burn the naan.
Remove the cooked naan from the tawa and place it on a plate. Immediately brush the top surface generously with butter.
Repeat the same process with the remaining dough balls and paneer filling.
Serve the hot stuffed naan immediately with green chutney or any other desired accompaniment.