In a saucepan, heat the vegetable broth and keep it simmering on low heat.
In a separate large pan or pot, heat the olive oil over medium heat. Add the chopped onion and minced garlic, and sauté until softened and translucent.
Add the sliced mushrooms to the pan and cook until they release their moisture and start to brown. Remove the mushrooms from the pan and set them aside.
In the same pan, add the crumbled impossible meat and cook until browned and cooked through. If using, deglaze the pan with white wine and cook until the liquid has evaporated.
Add the Arborio rice to the pan with the impossible meat and stir to coat the rice in the oil and juices.
Begin adding the vegetable broth, one ladleful at a time, stirring continuously until the liquid is absorbed before adding more. Continue this process, adding the broth and stirring until the rice is al dente and creamy in texture. This should take about 20-25 minutes.
Once the risotto reaches the desired consistency, stir in the cooked mushrooms and vegan Parmesan cheese (if using). Season with salt and pepper to taste.
Remove the risotto from the heat and let it rest for a few minutes before serving.
Garnish with fresh parsley or basil before serving.