Add flour, salt, carom seeds, and cumin seeds to a large mixing bowl. Mix in oil until the flour resembles crumbs.
Add water gradually, knead into a stiff dough. Cover and rest for 10 minutes at room temperature.
Divide dough into small pieces, roll each into thin discs using a rolling pin. Prick with a fork to prevent puffing.
Preheat the air fryer to 170°C for 5 minutes.
Place mathris in a single layer in the air fryer basket. Brush lightly with oil.
Air fry for 14–15 minutes at 170°C, flipping halfway, until golden brown.
Cool on a wire rack before storing in an airtight container.