Defrost the spinach.Place it in a colander and press it until as much moisture as possible is removed.Mix all ingredients , and blend well.Put it in a shallow baking dish (stoneware works best) in the oven for 20 minutes at 350°F.Remove from oven.While still hot top it with remaining cheese, heat in oven again for 5 minutes.Remove and cool below lava stage and serve.Goes well with tortilla chips.