Finely chop the onion and garlic.
Slice the mushrooms into bite-sized pieces.
Add olive oil to the pan and sauté the garlic and onion.
When the onion becomes translucent, add the mushrooms and stir-fry.
Add the oatmeal and cook together with the other ingredients.
Pour in vegetable broth or water and stir while cooking.
Season with salt and pepper.
When the water has reduced and the oatmeal is soft, turn off the heat.
Finish with parsley.