I would:
chop and fry a medium sized onion in olive oil
finely chop a clove of garlic
Add: a tablespoon of medium curry powder
a large pinch of turmeric, a few cumin seeds if you have them (not essential)
Add: some spinach if you have it, or cooked cauliflower, or quartered tomatoes (these are optional)
Add a knob of butter and cook the mixture, keeping it moving with a wooden spoon/spatula, until the powdered ingreients are well blended and the butter melted
Add the potatoes and some fresh coriander.(if you haven't got fresh coriander, use dried, but add it with the onions/garlic/curry powder etc)Mix and cook until potatoes are coated and piping hot
If it seems too dry, add a little water or some more butter/live oil if you're not bothered about fat 
Serve
I'm sure there are hundreds of ways, but this is my personal recipe and I think it tastes gorgeous.