Preheat oven to 220 degree C.
For the pizza dough, please refer to:
Chop ham into small pieces. In a bowl, add in ham bits and Mushroom. Pour in a little olive oil, a little salt. Mix well.
Poke pizza dough with a folk several times. Brush pizza dough with tomato sauce.
Sprinkle cheese over it.
Then spread ham & cheese over cheese.
Top with another layer of cheese. Sprinkle a little black pepper.
Bake for 15-20 mins.