Combine all the ingredients for the seasoning in a large bowl.
Pop chicken into the seasoning bowl and add the lime juice and 1 tbsp of the Oil. Set aside for 30 minutes - 2 hours. (This is optional!)
Heat 1 tbsp oil in a large pan over medium/high heat.
Add some of the chicken and cook for 3 - 5 minutes on each side, until nicely charred. Transfer to a tray, cover loosely with foil. Repeat with remaining chicken.
Wipe the pan with tissue paper. Turn heat up and add a drizzle of oil
Add the onions and peppers. Cook for a minute and add salt and pepper. Cook for a further 2 minutes until tender but still crispy.
Dry pan fry the tortillas for 1-2 minutes each side.
To serve, add the peppers and onions to the warm tortilla, top with chicken, sour cream, lime juice and coriander leaves.