Lightly grease a frying pan and place over a medium heat.
Place one of the tortillas into your frying pan and add the sliced chicken, sliced tomato, baby spinach leaves, mozzarella cheese and feta.
Spread the basil pesto over one side of the remaining tortilla and place on top of the tortilla already in the pan.
Cook the Quesadilla for 3 minutes or until the tortilla begins to brown before carefully flipping over and cooking for another 3 - 4 minutes or until the cheese has melted and the tortilla has browned.
When cooking your tortilla it will shrink as it cooks, don't worry though as once you have cooked both sides, your Quesadilla will be the same size!