For the crust: In a large bowl, whisk together flour and salt. Cut in the cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs with some pea-sized pieces of butter remaining.
Gradually add ice water, 1 tablespoon at a time, mixing until the dough just comes together. Be careful not to overmix.
Gather the dough into a ball, flatten it into a disc, wrap it in plastic wrap, and refrigerate for at least 30 minutes.
Preheat oven to 375°F (190°C). On a lightly floured surface, roll out the dough into a 12-inch circle. Carefully transfer the dough to a 9-inch pie plate. Trim and crimp the edges.
Line the pie crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes, then remove the parchment paper and weights and bake for another 5-7 minutes, or until lightly golden.
For the filling: Scatter the crumbled bacon and shredded Gruyère cheese evenly over the bottom of the pre-baked pie crust.
In a medium bowl, whisk together the eggs, heavy cream, salt, pepper, and nutmeg until well combined.
Pour the egg mixture over the bacon and cheese in the pie crust.
Bake for 30-35 minutes, or until the center is set and the top is golden brown. If the crust edges start to brown too quickly, cover them with foil.
Let the quiche cool for at least 10 minutes before slicing and serving.
Notes
Enjoy this classic Quiche Lorraine as a standalone dish or with a side salad.