Preheat the oven to 350 degrees F (180 degrees C).
Grate Parmesan Cheese (1/3 cup) and set aside.
Grate Gruyère Cheese (1 cup) and set aside.
Roll out the Pie Crust (1).
Saute the Bacon (150 gram) on medium-high heat for a couple of minutes, just to brown the meat.
Combine Salt (1/2 teaspoon), Egg (2), Ground Black Pepper (1/4 teaspoon), and parmesan cheese in a bowl.
Pour in the Heavy Cream (250 milliliter), and stir to combine.
On the pie crust, sprinkle the gruyere cheese.
Then sprinkle the bacon.
Then pour in the eggs/cream mixture.
Bake at 350 degrees F (180 degrees C) for 40 minutes.
Remove from the oven, and let it sit on the counter until completely cool, then serve.