Preheat oven to 350º. Combine all pie crust ingredients in a mixing bowl. Form dough into a disc, wrap in plastic, chill until firm.
Place dough between two sheets of wax paper or parchment paper and roll out to 1/16-inch thickness. Transfer dough to a 10-inch pie plate or 8-inch springform pan.
For pie plate, trim dough, and crimp edges. For springform pan, press edges into sides and trim upper edge.
Sprinkle with breadcrumbs. Place pan on sheet tray, in case of an overflow during baking.
Whisk together custard ingredients. Place ingredients for preferred filling (see below) in bottom of dough-lined pan. Pour custard mixture over filling.
Bake 35-45 minutes. Quiche is done when a small knife inserted in center comes out clean. Serve warm or at room temperature.