Rinse Poha (rice flakes) under tap water until soft.
Rub and squeeze all the water out. Set it aside.
Repeat the same with oats. Transfer the oats to a colander. Sprinkle oats with water until they are soft.
Do not rinse oats or they will become soggy. Fluff it with a fork.
Oats should feel soft and dry, not mushy. Set it aside.
Combine potato, onion, cumin powder, chili powder, chaat masala, fennel seeds, cilantro, salt, and lemon juice to a mixing bowl (except oil). Mix well.
To this potato mixture, add poha and oats. Mix to combine. The mixture will feel sticky at this point. Add cornstarch and mix again. Grease a square dish and spread this mixture in that dish. Chill this mix for 30 minutes in the refrigerator. After the resting time is over, remove the dish from the refrigerator and cut it into desired shapes. Grease a pan and spread the cutlets around.
Cook from all the sides until evenly brown.
You can shape the poha and oats cutlets in any form you like.
Serve hot with the dip or chutney of your choice.