To a bowl add the chicken, yoghurt, paprika, chilli flakes, lemon juice, garlic, salt & pepper. Cover and marinate in the fridge for at least 4 hours.
Once marinated, thread the chicken onto skewers and cook in the air fryer for 25 mins at 190C (or 35 mins at 200C in the oven).
10 mins in, melt the butter and mix with some coriander & lemon zest, then brush the skewers with some of the butter. Repeat every 5 mins until cooked, then serve.