Chop the onion and fry in little oil for about 5 minutes until soft.
Meanwhile, rinse then drain the beans and corn.
Add the cumin powder to the onion, stir for 1 minute, then add the beans and corn. Heat through.
Peel the avocado, cut the flesh into small chunks. Roughly chop the coriander.
Take off the heat the beans and corn, stir in the coriander and avocado chunks. Add the lime juice, then crumble over the cheese. Season with salt and pepper.
Meanwhile, in a pancake pan warm through the tortilla sheets, then slide them onto a plate.
Add 2-3 spoonfuls of bean & corn mixture, fold in half and enjoy!