Clean and thinly slice mushrooms such as button mushrooms.
Finely chop the onion.
Heat olive oil in a pan and sauté the onion.
Add the mushrooms and sauté together.
Add the rice and stir-fry for another 2-3 minutes.
Pour in white wine and cook until the alcohol evaporates.
Gradually add warm vegetable stock or water, stirring until the rice is cooked.
Season with salt and pepper.
Add Parmesan cheese and butter, mixing well.
Serve the finished risotto in a bowl and garnish with parsley.