If you are making your own pie crust, refer to the link in the blog above to get the full recipe. If you are using a store-bought frozen crust start by thawing and then follow the instructions for pre-baking.
Finely slice 2 scallions, both white and green parts.
Whisk 3 eggs, 1 1/4 cup heavy cream, salt, pepper and nutmeg in a medium bowl. Add the sliced scallions.
Scatter half of the cheddar cheese in the pre-baked pie shell. Top with 1 cup of diced ham. Pour the custard on top and then top with the remaining 1/2 cup of grated cheddar cheese.
Wrap the crust with aluminum foil to avoid over-baking.
Bake quiche on the middle rack in a pre-heated 375 degree oven for about 35 minutes or until the custard is set and nicely browned. Test by inserting a knife in the center of the quiche to be sure it is completely cooked. Knife will come out clean if it is.
Transfer to a rack and let cool for about 15 minutes before serving.