Mushroom Rice Bake with Gravy

Name: Mushroom Rice Bake with Gravy
Prep time: 10 min
Cook time: 45 min
Total time: 55 min
Cuisine: European, British
Ingredients: 225g/1 cup uncooked basmati rice (or other long-grained rice); 1 tbsp dried parsley; 2 tsp dried thyme; a good grinding of salt and pepper; 500ml/1 pint/2 cups onion gravy (or vegetable stock); 150ml/¼ pint/½ cup boiling water; 500g/1.1 lb closed cup mushrooms (or any standard mushroom); 1 tbsp olive oil