Preheat oven to 375 degrees. Grease a 9-inch oval baking dish or equivilant with non-stick cooking spray.
Defrost spinach in the microwave or under warm water. Use your hands to squeeze out all the excess moisture in the spinach. Add to a medium mixing bowl.
Add remaining ingredients to the spinach. Mix until combined. Pour into prepared baking dish and bake 30 minutes or until hot and bubbly.