Mash boiled potatoes.
Roast the oats and then grind them.
Put the grinded oats in the mash potatoes.
Add salt, green chilli,coriander leaves, black pepper, red chilli powder, chaat masala in it.
Mix them very well.
Now make tikkis or patties of it.
After making all the patties.
Take a flat pan.
Brush it with oil.
Put the tikkis on it
Brush oil on both the sides of tikki.
When it gets brown and crispy.
Let it down.
Now take the bun.
Cut it from the middle.
Roast it on pan first.
Now on one side of bun spread hung curd.
After that put lettuce leaves.
Then put slice of onion.
After onion put tikki.
After tikki put tomato slice.
After that spread pizza sauce on the other bun.
After spreading cover the tikki from this bun.
Now serve it hot with ketchup and chutney.