Chop the onion and garlic.
Cut the mushrooms and broccoli into bite-sized pieces.
Heat olive oil in a pan and sauté the onion and garlic.
Add the mushrooms and broccoli, and stir-fry together.
Add oatmeal and cook briefly, then pour in milk and heavy cream.
Simmer over low heat while stirring until thickened.
Season with salt and pepper and add Parmesan cheese.
Serve in a bowl to finish.