Preheat oven to 400 degrees.
In a medium bowl, mix bacon, onion, and cheeses together. Place this mixture in the unthawed pie crust.
Mix the eggs and half & half together in a bowl. Pour the egg mixture over the cheese mixture.
Bake in preheated oven for 15 minutes at 400 degrees. Reduce heat to 350 degrees and bake for an additional 35 minutes, until top of quiche begins to turn brown.