You're going to start by frying your mushrooms. First get the pan hot, add a dash of oil followed by about half of your mushrooms. Let them caramelise for about a minute before turning and cook for another minute. Remove from the pan and repeat with the 2nd batch. Set aside for later.
Using the same pan, add some fresh oil followed by the onion and garlic. Allow these to simmer for a couple of minutes on medium/low until soft and the onions have turned translucent.
Add the risotto rice and stir well, allow to cook for a moment.
Next, pour in the white wine, then stir and allow to simmer until the wine is absorbed/evaporated.
Now, one cup at a time, add the stock, stirring every couple of minutes to prevent sticking and encourage break down of starches in rice.
Add and stir through the thyme on your last ladle/cup-full of stock.
One the rice is cooked, stir through two thirds of your mushrooms.
Season to taste.
Serve with the remaining mushrooms on top and parmesan!