When cooking quiche do you have to cook the bacon and onions before adding to quiche?

Yes...at least the bacon. You don't want it to be over-done but it should be nicely "rendered" and beginning to lose the "raw" look. You don't want to add bacon when it's just out of the fridge. The onions can be added raw but their flavor is enhanced if you just saute them to bring out the natural flavors. It also makes the quiche look nicer...more prepared.