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Heat oven to 220C/200C fan/ gas 8. Line two large baking sheets with baking parchment. Brush the potato slices with oil, season and sprinkle over the paprika. Bake for 10-15 mins until completely crisp.
Reduce oven to 200C/180C fan/gas 6. Transfer half the crisps to an ovenproof dish, layer with half the beans and cheese, then repeat. Return to the oven for 10 mins until the cheese melts.
Meanwhile, mix all the salsa ingredients and season. Top the nachos with salsa and coriander.