Oven baked risotto

Name: Oven baked risotto
Cuisine: Mediterranean, European, Italian
Ingredients: 3 tablespoons butter; 150g mixed mushrooms, torn into small pieces; 300g risotto rice; 125ml dry white wine; 1 litre good-quality hot chicken or vegetable stock; 4 tablespoons freshly grated Parmesan, plus more to serve; salt; 1 onion; 2 cloves of garlic; freshly ground black pepper; fresh parsley, chopped, to serve