If mixing by hand (my preference), combine flour and salt in a large bowl, then add the chilled cubes of butter. Use two forks or a pastry blender to cut in the butter. If using a pastry blender, combine flour and salt in the bowl and pulse to combine. Add the butter, then pulse for about 10 seconds. For either method, the mixture should look like coarse crumbs with some large pieces remaining.
Slowly, add in ½ cup of ice water until mixture just holds together. The dough should not be wet or sticky. (If using a food processor, do not process for more than 30 seconds.) If the dough sticks together when you squeeze it between your fingers, it is ready. If it's still crumbly, add in more ice water, 1 tablespoon at a time.
Prepare two pieces of plastic wrap. Divide dough in half and roll into a ball. Wrap each ball with a piece of the plastic. Flatten the ball into a disk. Refrigerate at least one hour or overnight. The dough may be frozen for up to 1 month. Thaw in the refrigerate overnight before using.
Quiche
On a lightly floured surface, roll out the dough to a 14-inch circle, about ¼-inch thick. Fit into a 10-inch pie dish or tart pan, gently pressing dough to fit. With a small knife, trim excess dough, making the edge flush with the rim of the dish. Pierce the bottom of the shell with a fork. Refrigerate until firm, about 30 minutes.
Meanwhile, make roasted peppers. First, wash and dry the peppers. Remove stalks and cut into quarters. Discard the seeds. Place the peppers skins-up on a baking sheet lined with foil, and drizzle with olive oil. Broil on high in the oven until the skins are just turning black, about 15 minutes. Remove from the oven and let cool.
Preheat oven to 375°F (190°C) degrees. Line the pie shell with parchment paper, then fill with pie weights, dried beans or rice. Bake for 30 minutes or until crust has started to brown at the edges. Remove parchment and weights, then continue to bake for 5 to 10 more minutes. The bottom of the crust should be dry but not yet golden brown. Transfer to a wire rack to cool slightly.
While crust is baking, complete the filling. Peel the skins off the peppers, then cut the peppers into thin julienne slices. For the custard, whisk together milk, cream and eggs until frothy, then stir in salt, nutmeg, cayenne pepper and black pepper.
Place pie dish on a rimmed baking sheet. Sprinkle half the parmesan and half the cheddar over the bottom of the crust. Layer the roasted peppers, and top with the rest of the parmesan and cheddar. Crumble goat cheese over top. Carefully pour in the custard over the cheese.
Bake until set, about 30 minutes. The edges should be set, but the quiche should jiggle slightly in the center. Cool for at least 30 minutes, but ideally overnight. Quiche can be served cold, room temperature or warm. If serving warm, heat it in a 300°F (150°C) degree oven until just warm to the touch.