- Preheat oven to 180 degrees C (Gas Mark 4).
- Mix together all ingredients except Parmesan cheese.
- Add salt and pepper to taste.
- Spoon into baking dish and top with Parmesan cheese.
- Bake for 45 minutes.
For added flavor try: adding a few shakes of bottled hot sauce; adding 1 tablespoon of lemon juice; adding 50g chopped asparagus; using fresh tarragon instead of dried; substituting thyme for tarragon; or topping with bread crumbs seasoned with garlic.