Preheat oven to 425 degrees. Prick the pie crust all over with a fork. Don't forget the sides! Pricking holes in the pie crust allows the steam to escape while it's baking.

Sprinkle bacon, cheese and onion into pie crust.

In a large bowl, combine slightly beaten eggs, heavy cream or half and half, salt, pepper and cayenne pepper. Pour mixture over bacon, cheese and onion.

Bake for 15 minutes. Reduce oven temperature to 325 degrees and bake 25-30 minutes longer or until knife inserted comes out clean. Let stand 10 minutes before cutting.

Refrigerate leftovers.