Preheat oven to 350 F. and grease a 9-by-13-inch pan or two 9-inch pie pans.

Squeeze as much water as possible out of the spinach.

In a large bowl, mix spinach, eggs, cheese and salt.

Transfer the mixture into the prepared baking dish(es) and bake for 45 minutes to 1 hour, until the top is golden brown and the inside is cooked through.