Preheat oven to 425°F (220°C).

Prepare your pie crust according to your recipe or package instructions.

Sprinkle the crumbled bacon, shredded Swiss cheese, and finely chopped onion evenly into the prepared pie crust.

In a separate bowl, lightly blend the eggs.

Add the half and half, salt, pepper, and cayenne pepper to the eggs and beat until well combined.

Carefully pour the egg mixture into the pie crust, over the bacon, cheese, and onion.

Bake in the preheated oven for 15 minutes at 425°F (220°C).

Reduce the oven temperature to 300°F (150°C).

Continue baking for approximately 30 minutes, or until a knife inserted into the center comes out clean.

Remove the quiche from the oven and let it stand for 10 minutes before cutting and serving.