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Fry onion in oil in a large ovenproof frying pan until soft. Add chilli flakes and courgettes, and cook for 5 mins more.
Tip spinach into a large colander and pour over a kettle of boiling water. Cool under cold running water, then squeeze dry. Scatter spinach into the pan, then dot over ricotta.
Heat the grill to high. Beat eggs with seasoning, pour into the pan and cook until almost completely set. Finish under the grill for 3 mins or until golden and cooked through.