Finely chop the onion and mushrooms.
Add olive oil to a pan and sauté the onion.
When the onion becomes translucent, add the mushrooms and continue to sauté.
Add oatmeal and mix well.
Pour in vegetable broth or water and cook over medium heat, stirring occasionally.
Simmer until the oatmeal becomes tender.
Season with salt and black pepper.
Finish with parmesan cheese.