You may substitute sausage, Canadian bacon, crab meat, broccoli or spinach for the bacon and any other type of cheese for Swiss.
Heat oven to 350 degrees. Place crumbled bacon and onion in bottom of pie (deep dish); set aside. Slightly beat eggs, then add remaining ingredients and beat with fork. Pour mixture into pie crust and bake 15 minutes at 350 degrees,
Let quiche set 15 minutes before serving.