Add the garlic and 1 tbsp of the yogurt to a blender and blitz to a smooth paste. Tip the paste into a bowl with the chilli powder, ground coriander, ground turmeric, garam masala and a pinch of salt and mix. Add the remaining 1 tbsp yogurt and the chicken and mix until the chicken is coated. Set aside the chicken to marinate in the fridge for 2-3 hours or preferably overnight.
