Whisk the flour and salt together in a large mixing bowl. Add the butter and use your finger tips to rub the butter into the flour until a crumb-like texture with no large lumps. Try and work quick so the butter stays cold.
Add in 2 tbsp cold water and use a knife to cut and mix the water into the flour. Once the water is well distributed the crumbs should start to clump together. Pick up a small amount and check if it is able to mould into dough. If the dough is too crumbly you can mix in more water 1 tsp at a time. Form the dough into a ball then shape into a large disk and tightly wrap it in cling film. Rest in the fridge for at least an hour (up to overnight).
Lightly flour a clean surface and roll out the dough until it comfortably covers the rim of the pie dish. Grease the dish with butter then carefully place in the pastry, gently pressing it into the base of the dish. Trim excess pastry then prick the base all over with a fork. I recommend placing it back in the fridge for 15mins or so to cool back down at this point. Preheat oven to 180C/350F.
Add foil or baking paper on top of the pastry and weigh down with pie weights, ensuring they cover the whole base. Place in the oven for 20 minutes. Remove from the oven and carefully remove the pie weights and baking paper/foil. Place back in the oven for 5-10mins until light golden. Check after 5 mins and remove if it's golden and/or air bubbles are forming.
During this time fry the bacon over medium heat until crispy with the fat rendered down. Remove and dry on kitchen roll, then remove all but a couple of tsp of fat from the pan. Fry the shallots in the leftover fat until soft and golden, then remove and place to one side with the bacon (set some of the bacon aside to garnish). In a medium-sized mixing bowl whisk together the eggs, cream, salt, pepper and nutmeg until smooth and well-combined.
Sprinkle half of the bacon & shallots into the pie, then top half of the cheese and half of the cream. Repeat then place in the oven for 25-30 minutes, or until golden on top and just about set in the centre (check with a knife to see if it's set - keep in mind it will carry on cooking slightly as it rests). The quiche should jiggle a little. Rest for 10mins before serving up. Garnish with bacon and chives then tuck in and enjoy!