Firstly, in a large mixing bowl take boiled and mashed potato, t onion, tomatoes and coriander leaves..

also add chaat masala and salt.

Combine well making sure all the ingredients are mixed well.

now take 2 slices of bread and spread butter and on each slice of bread.

Combine well making sure all the ingredients are mixed well.

now take 2 slices of bread and spread butter and potatoes mixture on each slice of bread.

And

cover with another slice of bread and press gently.

roast the sandwich with butter on both sides.

finally, cut the bread in half and serve spicy aloo sandwich.