First, prepare the pastry if using homemade. Roll out the pastry and place it into a pie dish. Once the pastry is in place, refrigerate for 10-15 minutes to prevent it from shrinking during baking.
Slice the leeks into thin rings. Heat the oil in a skillet over medium heat, then add the leeks. Sauté the leeks for 5-7 minutes, until softened and slightly caramelized.
Crack the eggs into a bowl, add the heavy cream and milk. Season with salt and pepper, then whisk well to combine.
Stir the grated cheese into the egg mixture, then add the softened leeks.
Pour the prepared mixture over the pastry in the pie dish, spreading it evenly. Bake in a preheated oven at 350°F (180°C) for approximately 30-35 minutes, or until the top is golden brown.
Let the quiche cool slightly before slicing and serving.
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