Preheat the Oven to 350 degrees F.
Cook the bacon in a frying pan until crisp. Let it cool on a paper towel-lined plate. Once cool, roughly chop it up.
Add the diced onion to the bacon fat. Season to taste with salt to help release the juices. Cook until the onion has softened and is lightly browned.
Add the chopped leafy greens at the end and saute until soft and wilted. Remove it from the heat and set it aside.
In a large bowl, whisk together the milk, eggs and egg white.
Add the bacon, onions, greens, thyme, nutmeg, cloves, paprika, cayenne, and pepper. Pour the mixture into the pie crust.
Bake the quiche for about 40 minutes. The edges should be golden brown and the center should feel just set.
Remove the quiche from the oven and let it cool on a rack.
Serve warm, or at room temperature. Refrigerate any leftovers by covering in plastic wrap.