Heat oil in a large vessel over high heat. Add chicken and sauté until lightly browned, about 5 minutes. Add ginger garlic paste and green chilies and sauté until fragrant and lightly browned, about 3 to 5 minutes. Reduce the heat slightly if the meat is burning (ideally cooking at a high temperature).
Charcoal Infusion- In a well-ventilated kitchen, heat charcoal over the flames of a gas stove until grey and red hot. Using tongs, carefully transfer the charcoal to a small bowl, and place it in the vessel with the karahi. Pour oil and quickly cover the vessel completely. Allow the meat to infuse with charcoal flavor for 5 minutes. Remove bowl and carefully dispose charcoal.