Take a wok, into it, add oil and heat it.
Add cumin seeds.
Add slit green chillies into it.
Reduce the flame.
Add roasted cumin seeds powder.
Add roasted coriander seeds powder and mix.
Add salt as per taste.
Add red chilli powder and turmeric powder and stir the mixture well.
Add in the diced potatoes which were kept aside.
Keep tossing the wok until the diced aloo gets coated well with all the spice mixture.
Cook for one or two minutes.
Lastly add in some freshly chopped coriander leaves and toss them again.
Serve hot with roti or paratha.