Once the potatoes are cooked through drain and peel them. Add to another mixing bowl and mash them roughly.
Add in the onions, chillies, salt, cumin seeds, garam masala, coriander and garlic.
Mix it all up and you should end up with a dryish mixture
Now, using a rolling pin we're going to roll out 2 small chapattis about a quarter to half an inch thick and 5 inches in diameter.
Pile the mixture on one of the small chapattis and put the other part over the top and lightly press in around the edges.
Use the pictures to guide you.
Flatten carefully with your hands, then roll out using a rolling pin until its around 10 inches in diameter.
Heat some butter on a flat chapatti pan as shown in the pictures and carefully place the filled chapatti once melted.
Ok, that's the hard part over with.
Fry lighty adding more butter as you turn it.
First we cook lightly so the chapatti doesn't break apart then we turn it over and cook the other side lightly.
Now the top should be just cooked enough for you to run a block of butter over it, once the bottom is the same turn over and repeat until you have butter both sides once.
Fry until the chapatti is brown on both sides and you're done.
This can be eaten with yogurt to take the edge of the chilli or on its own with tea.