Place a pan of salted boiling water onto medium heat. Add in your chicken breasts and leave to simmer for 15-20 minutes.
Meanwhile, in a large bowl, combine your self-raising flour and greek yoghurt. Mix with a spoon and then once a rough ball forms, knead with your hands for 20 seconds. The dough shouldn't stick to your hands that much, so if it's sticking a lot add more flour. Wrap in clingfilm and set aside while you make your filling.
In a large bowl, mash your avocado. Then add in your chopped red onion, minced garlic, finely chopped red chillies, chopped coriander, fresh lime juice, salt, pepper, and mayonnaise. Give everything a good mix then set aside.
When your chicken is cooked, remove from the water and set on a chopping board. Shred using two forks and then leave to cool.
Get your dough and knead it once again for 10 seconds. Slice into 6 equal pieces.
One by one, get a piece of dough and flatten it into a flat circle around 10cm in diameter and 1cm thick. Repeat for all your arepas.
Place a large frying pan on medium heat and once hot, add in your arepas. Fry on each side for 4-5 minutes until puffed up, spotted brown on each side, and cooked. Set aside to cool.
Add your shredded chicken into your filling mixture and give it a stir. Slice open your arepas not all the way and then add in 2 tablespoons of the filling into each arepa. Serve up and enjoy! (See my step by step instructions further up the blog for photos!).