Steps
1. In a saucepan, heat the vegetable broth over low heat.
2. In a separate pan, heat olive oil and butter over medium heat. Add the chopped onion and garlic, sauté until translucent.
3. Add the sliced mushrooms and cook until they release their moisture, about 5 minutes.
4. Stir in the Arborio rice, cooking for 1-2 minutes until lightly toasted.
5. Begin adding the warm vegetable broth one ladle at a time, stirring frequently until the liquid is absorbed before adding more.
6. Continue this process for about 18-20 minutes until the rice is creamy and al dente.
7. Stir in the grated Parmesan cheese, and season with salt and pepper to taste.
8. Serve hot, garnished with fresh parsley.