In a saucepan, warm the broth over low heat. Keep it simmering while you prepare the risotto.
In a large skillet or saucepan, heat the truffle oil over medium heat. Add the sliced mushrooms and sauté until they are tender and golden brown.
Stir in the Arborio rice and cook for 2-3 minutes until the rice is well-coated with the truffle oil and slightly translucent.
Pour in the white wine and cook until it has mostly evaporated.
Begin adding the warm broth, one ladle at a time, stirring continuously. Allow the liquid to be absorbed before adding more broth. Continue this process until the rice is creamy and cooked al dente, about 18-20 minutes.
Remove the risotto from heat and stir in the grated Parmesan cheese and butter. Season with salt and pepper to taste.
Garnish with fresh parsley and an extra drizzle of truffle oil before serving.