Peel the boiled potatoes and eggs. Grate the eggs and potatoes.
Mix grated potatoes and eggs. Add all the sauce, finely chopped onion, salt, grated cheese cubes, oregano and mayonnaise. Taste and adjust the seasoning.
You can add 1-2 tablespoon more mayonnaise if you like. Mix everything well. See notes for options to make your sandwiches more spicy.
On a bread piece spread a thick layer of egg and potato mixture. Place cheese slice on it.
You can make a layer of lettuce, thinly sliced cucumber, tomato and onion over the egg potato mixture if you want.
Take one more bread and spread green chutney or any chutney of your choice.
Place the bread on cheese slice. Keep chutney side down. You can make 10-11 sandwiches with this egg potato mixture.
Toast the sandwich on a pan from both sides with little butter or oil till golden brown.
Second methodGrate the boiled potatoes. Add all the sauce, grated cheese cubes, mayonnaise, oregano and 1/2 teaspoon salt or to taste. Add less amount of salt than above because we are using only potatoes. Taste and adjust the seasoning. Spread a layer of potato mixture. Grate boiled egg above potato. Sprinkle black pepper powder and pink or black salt over the grated egg. I used pink salt. Vegetarian people can skip this step. Place cheese slice over it.
Spread green chutney or any chutney on a bread. Place it on the cheese slice chutney side down. Make sandwiches as above method.
Serve hot with any sauce, ketchup or chutney. Sandwiches have different sauce and absolutely delicious so you can enjoy the sandwiches without any sauce or chutney.