Take mashed potato in a bowl. Grate three boiled eggs into it and slice the remaining egg and set aside for garnishing.
Add ginger paste, garlic paste, green chillies, coriander leaves, garam masala powder, lemon juice, salt and bread crumbs. Mix well. Divide the mixture into equal portions shaped into patties.
Heat sufficient oil on a non-stick tawa. Shallow fry patties, in batches, till golden from both the sides.Garnish with egg slices and mint leaves and serve hot with tomato ketchup or green chutney.