Whisk the eggs, heavy cream, salt, and pepper together in a large bowl.
Add the cheeses and onions to the egg mixture and stir until fully combined.
Roll out pie crust and press into a 9 inch pie dish. Crimp edges with a fork if desired.
Pour the egg mixture into the prepared pie crust and bake for 38-40 minutes or until quiche is fully set in the middle.
Let cool for 8-10 minutes before serving. Enjoy warm or room temperature!
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