Preheat oven to 180C/350F (all types).
Peel and cut the potatoes into 1 ¾ cm / ⅔" cubes. Place in a large bowl.
Add all remaining ingredients except mozzarella. Mix.
Pour into a 3 litre / quart baking dish (mine is 22cm / 9" square x 6 cm / 2.3" high).
Cover with foil. Bake 60 minutes, or until potatoes are tender.
Remove foil, sprinkle over mozzarella cheese. Bake for 25 minutes or until cheese is golden.
Rest for 5 - 10 minutes before serving, garnished with extra theme leaves if desired.
