Cut the broccoli and mushrooms into bite-sized pieces.
Thinly slice the onion.
Heat olive oil in a pan and sauté the onion and mushrooms.
Add the broccoli and stir-fry together.
Pour in the milk and heavy cream, then bring to a gentle boil.
Cook the pasta and mix it with the sauce.
Season with salt and pepper.
Serve the finished pasta in a bowl.