Add potatoes to a large stock pot and fill with cold water. Add salt and allow to boil until fork tender. Once ready strain water and allow to cool for a few minutes
Preheat oven to 350°F
Grease a large cake tin thoroughly with butter and add cooled boiled potatoes
Using the back of a cup gently press down on the potatoes to form a crust
Add spinach, diced ham, and tomatoes to the potato crust
In a large bowl whisk together milk, cream and eggs. Then carefully pour this into the shell
Top with a sprinkle of salt and pepper, hot pepper slices, and mozzarella
Place on top of a baking sheet and bake on the middle rack for 45-50 minutes at 350°F
Remove from oven and let cool for 10 minutes before slicing
Finish with chopped chives and enjoy
