In a pan heat butter add cumin seeds then add ginger,garlic,green chilli paste and cook for 2 min then add chopped onions and cook for another 10 min till brown then add tomatoes and cook till it become soft.
Then add chopped capsicum and cook till all mixture comes together
Add salt and all dry spices and add boiled mashed potatoes, mix well, add some water and on full heat start mashing the mixture till it all comes together.
Garnish with fresh coariander ,grated cheese and more butter serve with pav, naan.