Take a nonstick pan heat add oil. Add onion paste, garlic paste, black pepper powder and salt.
Stir well add mashed potatoes stir well. switch off the flame and make patties and shallow fry.
Take burger slice into two pieces and toast. Brush with butter both sides.
Apply tomato sauce on the bottom slice then followed by green salad, patties, mayonnaise, tomato slice, onion rings, cheese slice and finally top slice.