Heat oven to 180C/160C fan/gas Tip the chickpeas into a bowl and toss with the rapeseed oil, smoked paprika, cumin and coriander. Toss well until the chickpeas are well coated, then tip out onto a baking tray and bake for 35 mins, moving them round the tray halfway through so they dry out evenly and are crunchy. Leave to cool, then store in an airtight container.