Add ham and cheese in the bottom of your par-baked pie shell. Be sure to spread evenly over the crust. You want some ham and cheese in every bite.
In a medium mixing bowl, whisk together eggs, half-n-half, salt, pepper, ground mustard, and onion powder. Pour egg mixture over ham and cheese.
Bake quiche for 35 to 40 minutes or until crust is browned and eggs are set.
Remove from oven and all to rest for 10 minutes before serving. Garnish with chives, if desired.
For the pie crust, you can use a homemade pie crust or a store-bought crust. Just be sure to par-bake the crust for 10 to 15 minutes at 450 degrees F. Use foil and pie weights or dried beans to keep the sides of the crust from falling over during baking. You can par-bake your crust the day before to cut down on prep time in the morning.
If your pie crust browns too quickly, carefully place some foil around the edge of your pie to protect the crust while the quiche finishes baking.
Want to go deep dish? Add one extra egg, one more cup of cheese, and another 1/2 cup of ham to the above recipe.