Preheat the oven to 375°F. Roll out and press the pie crust into a 9-inch pie plate, being careful not to overstretch the crust. Crimp or flute the rim as desired.
1 pie crust
Sprinkle the ham and cheese evenly across the bottom of the pie crust.
1 cup cubed cooked ham, 1 cup shredded Swiss cheese
Crack the eggs into a large bowl, but place a small amount of the liquid from one egg -- it can be a mix of yolk and white -- aside in a small bowl to use later as your egg wash.
7 large eggs
To the large bowl with most of the eggs, add the cream, salt, parsley, and pepper. Whisk well to combine, then pour this mixture on top of the ham and cheese.
3/4 cup cream, 1 teaspoon kosher salt, 1/2 teaspoon dried parsley, 1/4 teaspoon black pepper
Add 1-2 teaspoons of water to the small bowl with a bit of egg. Stir this together with a fork, then use a pastry brush to gently apply this egg wash to the exposed outer rim of pie crust.
Place the pie plate on top of a baking sheet and transfer to the oven. Bake for 35-40 minutes, until the crust is golden brown and the center is set. A paring knife inserted into the center of the quiche should come out clean.
Let the quiche cool for about 5 minutes, then sprinkle with chives, thinly-sliced green onions, or other herbs as desired. Slice, serve, and enjoy.
chives or thinly-sliced green onions