This is one of those recipes that everyone requests for potlucks and I'm embarassed to tell them the recipe because it's so incredibly easy. I learned this one in college from my friend Mary who worked at a restaurant that served this. It's to die for.
1 c mayo
1 c parmesan
1 package frozen spinach
Mix together. If desired, top with extra parmesan or a little shredded mozarella. Bake until bubbly. Serve with tortilla chips or bread. That's it. See, I told you it was easy.