Preheat oven to 400 degrees F.
Place potatoes and rosemary in a microwaveable dish. Cover with a damp paper towel and microwave for 2 minutes, until almost cooked through.
Cover the bottom of the premade pie shell with potatoes, ham, and cheese. Place on a cookie sheet and set aside.
In a medium bowl, whisk together eggs, milk, and seasoning and pour into the pie shell.
Place quiche into preheated oven for 35 to 40 minutes or until eggs have set.
Recipe courtesy of Sandra Lee, 2008