Preheat the oven to 350°F.
In a large bowl, beat the eggs with a whisk until blended well. Add half of the whipping cream, whisk, then add the remaining whipping cream, salt and black pepper and whisk again until blended well, about a minute. Set aside.
To the pie crusts, evenly divide between the 2 the spinach, red onion, bacon and Swiss cheese.
Evenly pour the egg mixture on both pies.
Carefully place the quiches on a large sheet pan.
Bake on the middle rack for 40-45 minutes or until the tops are golden brown and egg mixture is set.
Allow the quiches to cool 10 minutes before slicing. If desired, you can freeze the quiche and when ready to bake, sit in the refrigerator the night before to thaw.