Make the pâte brisée. Combine 2 cups (260g) all-purpose flour, ¾ cup (168g) cold, cubed butter, and ½ tsp kosher salt in the bowl of a food processor fitted with blade attachment. Pulse until the butter is broken into small pea-size pieces, about 10x. Add 5 Tbsp ice water, then pulse until the mixture just holds together, about 15-20 short pulses. If needed, add 1 more tablespoon of water, then pulse again. Do not let the mixture form into a ball.
Chill the dough. Turn the dough out onto a sheet of plastic wrap, then bring the dough together, forming into a disc, and wrap tightly. Refrigerate for at least 1 hour, or up to 2 days before using.
Make the custard base. In a large bowl, whisk together 8 large eggs, 3 cups (750ml) heavy cream, 1 tsp kosher salt, ½ tsp black pepper, and ¼ tsp ground nutmeg. Set aside.
Prepare the crust. Roll out the chilled dough on a lightly floured surface (roughly 14 inches round), then transfer to the quiche pan. Use your hands to gently press the dough into and up the sides of the mold, then use the rolling pin to help trim any excess dough off the top by pressing down over the edges. Use a fork to prick holes all along the bottom of the dough. Transfer to the fridge to chill for about 15 minutes after rolling out. Preheat the oven to 375°F (190°C).
Blind bake the crust. Place the pan on a parchment-lined rimmed baking sheet, cover the dough with heavy duty aluminum foil, then fill with pie weights (or dried beans) right up to the top–this prevents the sides from shrinking. Bake for 40 minutes, then check on the progress. It will likely need an additional 30 minutes (so 1 hour 10 minutes total), but check every 15 minutes from here, or until the edges are golden brown and the center of the dough is dry. Allow to cool slightly, then carefully remove the foil and weights or beans.
Meanwhile, make the filling. Heat a large skillet over medium to medium-high heat. When hot, add bacon lardons then cook, stirring occasionally, until crispy, about 6-8 minutes. Use a slotted spoon to transfer the bacon to a paper towel-lined bowl to drain excess grease.
Assemble. Sprinkle the bacon and shredded cheese all over the pre-baked crust, reserving just a tiny bit of each, then pour the custard mixture on top. Sprinkle remaining cheese and bacon over the top.
Bake the quiche. Transfer to the preheated oven, then bake for 45 minutes. Reduce the temperature to 325°F (163°C), cover the quiche loosely with foil, then bake for an additional 30 minutes, or until the quiche has puffed up and the center has only a slight jiggle. Cool slightly, then enjoy warm or at room temperature with a side salad.