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Heat oven to 110C/90C fan/gas 1/4. Put the pittas on top of each other on a chopping board. With a bread knife, cut them into quarters, then cut each quarter in half again (so you end up with 16 equal-sized triangles).
Add the olive oil, a pinch of salt and the za’atar to a small bowl, and stir to combine. Using a pastry brush or your finger, coat the pittas on both sides with the mixture, then put them on a baking tray and bake in the oven for 30-40 mins until crisp.