When ready to cook, heat up large Sauce- pan with oil, and add onions, garlic,ginger, cinnamon stick, curry leaves, cardamom pods and curry powder, stir occasionally for about 2-3 minutes until onions is translucent.
Add tomatoes followed by chicken, stir and sauté for about 2-3 more minutes. Add chicken stock/ water if necessary to prevent any burns
Next add chickpeas, potatoes and chicken broth , about 1 1 1/2 cup , add more as needed. Bring to a boil and let it simmer until sauce thickens, it might take about 25 minutes or more