Heat oil in a pan and add chopped onion.

Add carom seeds and sauté until onions are translucent.

Mix in mashed potatoes, red chili powder, garam masala, salt, turmeric powder, and coriander powder.

Cook until the mixture is well combined.

Sprinkle chaat masala over the mixture and mix well.

In a bowl, combine all-purpose flour, carom seeds, ghee, salt, and black seeds.

Gradually add water and knead into a smooth dough.

Roll out the dough and cut into desired shapes.

Evenly spread the potato filling on the dough pieces.

Shape the dough into croissants.

Fry the croissants until golden brown.