In a two-cup measuring cup, crack three eggs.
Pour in enough milk until the total liquid reaches one and a half cups.
Add the ham, cheese, and green onions, adjusting the amounts to fit your pie plate.
Pour the egg and milk mixture over the fillings in the pie plate.
Bake in a preheated oven at 400 degrees Fahrenheit for 30 minutes.
Allow the quiche to stand for a few minutes before slicing.
