Ribbed penne, mushroom and ham pie

1. Clean and trim the mushrooms and cut into thin slices.
2. Put the oil, garlic, chopped parsley and mushrooms into a saucepan and cook over a moderate heat, stirring and turning occasionally, for 10-12 minutes.
3. Cut the ham and cheese into small dice.
4. Cook the pasta until al dente, drain well and stir in the mushrooms, ham and mozzarella.
5. Transfer to a buttered ovenproof dish and place in a preheated hot oven (500°F) until thecheese begins to melt and the pasta has browned a little.