1. Heat the olive oil in a large pan over medium heat. Add the chopped onion and garlic, and sauté until translucent.
2. Add the sliced mushrooms and cook until they release their moisture and become golden brown.
3. Stir in the Arborio rice and cook for 1-2 minutes until the rice is well-coated with oil.
4. Pour in the white wine (if using) and cook until the liquid is mostly absorbed.
5. Begin adding the vegetable broth, one ladle at a time, stirring frequently. Allow the liquid to be absorbed before adding more broth. Continue this process until the rice is creamy and cooked through, about 20-25 minutes.
6. Stir in the nutritional yeast, and season with salt and pepper to taste.