Add chopped onion, green chilli and grated ginger. Cook till it begins to brown.
Add all spice powders (turmeric, garam masala, coriander, fennel)including kasuri methi and salt. Cook for 2-3 mins or till the raw smell goes.
Add chopped methi leaves and mashed potato to this. Mix well.
Add 1/2 - 1 tbsp ghee to this to bring everything together.
Let the mixture cool for 10-15 minutes. Shape into patties.
Heat oil for shallow frying in a wide nonstick pan. Cook the patties each side for 3-4 mins till it's golden brown.
Notes
I added salt while boiling the potatoes as well. You can use chopped coriander leaves or a combination of coriander and mint leaves instead of methi leaves.You can also use oil instead of ghee to cook this, but ghee adds more flavor.You can also air fry this instead of shallow frying in the pan. You can skip the cheese if you don't like it. Serve it with ketchup or pop it inside a buttered and toasted pav, top it with some sliced onions and ketchup, and there you go...