Preheat your oven to 350°F (180°C). Prepare a 9-10 inch (22-24 cm) quiche dish or pie pan, and lightly grease it. This will prevent the pastry from sticking.
Roll out the puff pastry and carefully press it into the bottom and sides of the prepared dish. Use a fork to prick the bottom of the pastry. This helps prevent it from puffing up during baking.
Cover the pastry with parchment paper and weigh it down with pie weights (such as dried beans or rice). Bake for 10 minutes. Remove the weights and parchment paper, and bake for another 5 minutes to crisp the crust.
Meanwhile, peel the garlic cloves, place them in aluminum foil with a small pat of butter, wrap tightly, and bake in the oven for about 20 minutes, or until they are soft and lightly caramelized. This mellows and sweetens their flavor.
In a bowl, whisk together the eggs, heavy cream, grated Parmesan cheese, salt, and pepper. Mix thoroughly until you have a smooth, creamy mixture. Parmesan is salty, so taste before adding more salt.
Squeeze the roasted garlic cloves out of their skins, lightly mash them with a fork, and stir them into the egg and cream mixture. This will give the quiche its characteristic flavor.
Pour the filling into the pre-baked pastry shell, spreading it evenly. Gently shake the pan if necessary to ensure the filling is evenly distributed.
Bake at 350°F (180°C) for about 30-35 minutes, or until the top is golden brown and the center is set. If you're unsure, insert a knife tip into the center: if it comes out clean, it's done.
Let it cool for at least 10 minutes before slicing. This helps the filling to set properly, making it easier to slice.
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