Heat 1tbsp oil in a saute pan; add mustard and cumin seeds and once they start to splutter add onions and curry leaves and cook until onions are lightly browned around the edges.
Add the cooked potatoes and methi leaves; cover and cook until the leaves are wilted and cooked. Add turmeric and salt (keep in mind that sesame-chili powder has salt in it), cook for 2 minutes.
Add the sesame-chili powder; turn off the heat and serve with rice and dal of your choice for a complete meal.
To make the Sesame-Chili powder: Dry roast sesame seeds and red chilies on medium-low flame until sesame seeds turn light brown.
Grind the seeds along with salt into a coarse powder. Make sure not to over blend the mixture, because that will make it into a paste rather than a powder.