Preheat your oven to 350°F (180°C). Prepare a quiche or pie dish by greasing it or lining it with parchment paper. Tip: Preheating the oven ensures even baking!
Roll out the puff pastry and place it into the prepared dish. Fold the edges inward to create a rim. Prick the bottom with a fork to prevent it from puffing up during baking.
Cut the bacon into small pieces and cook in a dry skillet until crispy. Once done, remove it and place it on a paper towel to absorb any excess grease.
Peel and slice the onion. Sauté in a little olive oil until translucent, about 5 minutes.
Grate the cheddar cheese. Tip: For a stronger flavor, you can use aged cheddar.
In a large bowl, whisk together the eggs, heavy cream, salt, and pepper until smooth, ensuring a consistent mixture.
Sprinkle the cooked bacon and sautéed onion evenly over the pastry-lined dish, then top with the grated cheese.
Pour the egg and cream mixture over the fillings. Gently shake the dish to ensure the liquid fills all the gaps. Tip: Do not overfill, or it may overflow during baking.
Place in the preheated oven and bake for about 35–40 minutes, or until golden brown and the center is set. Check with a toothpick!
Let it rest for at least 10 minutes before slicing. This helps it slice cleanly and allows the flavors to meld together.
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