Creamy and rich, studded with smoky bacon, and brimming with nutty Gruyère cheese, this is the absolute best quiche Lorraine ever. And wait until you see how easy it is to make.
Thaw the pie crust until just soft enough to easily prick with a fork, about 10 minutes. Prick the bottom of the crust with a fork. Bake for 10 to 15 minutes, until the crust is lightly golden, checking every few minutes to make sure the crust doesn't puff up. If it does, gently prick the dough with a fork so it deflates.
Set the crust aside and reduce the oven temperature to 325 degrees.
Heat the oil in small skillet over medium-low heat. Add the shallot and cook until soft and translucent, about 3 to 4 minutes (try not to brown the shallots). Set aside.
In a medium bowl, whisk together the eggs, heavy cream, 1/2 teaspoon salt, 1/4 teaspoon black pepper, and nutmeg.
Spread the shallots evenly over the bottom of the cooked crust. Top with half of the bacon, all the Gruyère, and then the remaining bacon. Pour the egg/cream mixture over top.
Transfer the quiche to a baking sheet and bake for 35 to 45 minutes, until the custard is set (it shouldn’t jiggle when you gently shake the baking sheet) and the top is golden brown. Let cool for 5 minutes. Serve hot or warm to ensure a flaky, crisp crust. Chilled quiche often delivers a soggy crust.
Store leftovers in an airtight container (or wrapped in plastic) in the refrigerator for up to 3 days.