Heat ghee in a pot, add cinnamon stick and sliced onions, sautéing until translucent.
Add ginger paste, garlic paste, and chicken pieces; fry on medium flame for 5 minutes.
Add cubed potatoes, whisked yogurt, black pepper, and salt.
Pour in water, cover tightly, and simmer on low heat for 25 minutes until chicken and potatoes are tender.
Serve warm.