Preheat the oven to 400 degrees F (200 degrees C).
Place unthawed pie crust in a pie pan on a baking sheet. Mix bacon, chopped onion, and both cheeses in a medium bowl. Pour this mixture into the crust.
Mix eggs and half and half in a bowl until blended; pour the egg mixture over the cheese mixture.
Bake in preheated oven for 15 minutes. Reduce heat to 350 degrees F (175 degrees C) and bake until the top of the quiche begins to turn golden brown, an additional 35 minutes.