In a large bowl, mix the chicken, beans, sweetcorn, onion and fajita seasoning.
Preheat 1/2 tsp of the oil in a large frying pan over a medium heat.
Sit one tortilla in the pan, sprinkle over a small amount of the cheese (about 25g/1oz - no need to weigh but just as a guide!)
Spoon on a quarter of the chicken and bean mixture. (You’ll need to work reasonably quickly here so the bottom doesn’t start to burn.)
Sprinkle another 25g/1oz of cheese on top and sit another tortilla on top. Use the bottom of a clean saucepan to weigh down the quesadilla.
Cook on that side for 3 minutes, then remove the saucepan and carefully flip over. Cook for another 3 minutes.
Repeat this process to cook all of the quesadillas.
While you are cooking them, keep the others warm on a plate covered with tin foil OR keep warm in the oven on a very low heat.
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Chicken: Use precooked chicken for speed, leftovers, or cook your own. If cooking your own before making this recipe, 300g/11oz is about 2-3 chicken breasts. Or use other cooked meat, like ham.