I copied this recipe a few weeks ago and tried it last night.  I am no fan of onions at all, but I know my husband is, so I was thinking this isn't going to taste very good for me.  I was really wrong on that one.  It's a very good dish.
You can make it with bacon or almost anything else or you can just use it for the cheese and onions.

3 Tblsp. butter, softened and divided
1 (9 inch) unbaked pie shell
1 large onion, chopped........use less, if you want to.
9 slices of bacon, cooked......probably use more or less.
2 Cups Swiss Cheese, grated.....use a little more, if you want to.
1 Tblsp. all-purpose flour
3 eggs
1 Cup half-and-half
1/4 tsp. salt

Spread 1 Tblsp. butter over the bottom of your crust and set this aside.  In a skillet, saute the onions in the remaining butter until the onions are soft.  Try not to get any color on you onions.  Spread in the pie crust (pie shell).  Crumble up your cooked bacon and put that on top of the onions.   Toss your Swiss cheese with the flour and spinkle over the bacon and onions.
In a small bowl, whisk or beat your eggs and add your half-n-half and salt.  Pour this over the cheese.
Bake, uncovered, at 400 degrees for 10 minutes.  Leave your quiche in the oven and turn down the heat to 325 degrees.  Bake for 30-35 minutes longer or until a knife inserted near the center comes out clean.  Let this stand for about 10 minutes before you cut it.