METHOD

1. 01.Preheat the oven to 200°C/fan180°C/gas 6. Slice the potatoes 3mm thick and simmer in salted water for 5 minutes until just tender. Drain. Put the spinach in a colander, pour over freshly boiled water from a kettle to wilt, then refresh under cold running water and squeeze dry.
2. 02.Heat the oil in a frying pan over a medium heat and soften the onion, stirring, for 8 minutes. Stir through the garlic and cook for 2 minutes more, then remove to a bowl. Add the bacon to the pan and fry until starting to crisp. Add to the onion, then stir through the flour.
3. 03.Lightly grease a large ovenproof dish (about 2 litres) with butter. Mix the cream with the stock and season.
4. 04.Layer the potato, onion and bacon, spinach, shredded chicken and half of the cheese, pouring over the cream sauce as you go. Finish with a layer of potatoes. Season with salt.
5. 05.Bake for 30 minutes, then scatter over the remaining Reblochon and return to the oven for 10-15 minutes more until golden and piping hot.