2 tbsp sunflower oil
2 skinless chicken breasts , cut into 1.5cm/1/2in chunks
1 red pepper , deseeded and cut into 1.5cm/1/2in chunks
1 yellow pepper , deseeded and cut into 1.5cm/1/2in chunks
1 tsp ground cumin
1 tsp ground coriander
¼ tsp hot chilli powder
227g can chopped tomatoes
2 tbsp chipotle paste
4 spring onions , trimmed and thinly sliced
large pack coriander , leaves chopped
3 large flour tortillas
75g ready-grated mozzarella
1 ripe avocado , stoned and peeled
juice 1 large lime
1 garlic clove , crushed
2 heaped tbsp finely chopped coriander
36 cocktail sticks