First spread mayonnaise on one side each then place egg slices on one side and press with other mayonnaise slice and cover it.

And spread butter on it ready all sandwich and heat nonstick stick tawa and spread little butter on it and keep the sandwich of other side which u have spread butter now roast it golden brown on slow flame for a minute check carefully and flip the other side and roast a other side also.

Serve with coffee and enjoy the match time snack. It's taste is amazing