Boil potatoes in a pressure cooker for 3-4 whistles. Cool, peel, and grate.
Heat 3 tbsp oil, sauté ginger, green chilies, and cashews for 1 minute.
Add cumin, turmeric, chili powder, coriander, asafoetida, peas, and salt. Cook until peas are soft. Mash the mixture and set aside.
Add coriander, green chili, chaat masala, salt, and corn flour to the grated potatoes. Mix well and let rest for 15 minutes.
Divide the potato mixture, flatten into patties, and stuff with the pea mixture. Seal edges and reshape into round tikkis.
Heat oil in a pan and shallow fry on medium heat until golden and crispy on both sides.
Enjoy with mint raita, tamarind chutney, or green chutney.