I like the addition of a squirt of lemon juice, which brightens the taste. Adding some freshly-chopped mint is another option.

I also used 2 sheets of filo per triangle, since each sheet was about 12-inches (25cm), but if you prefer less dough, you can use one sheet. There are folks make spanakopita in a pie plate, although individual triangles give you more of the crisp-crunch of the filo, and are easier to freeze in individual portions.