Finely chop the onion and garlic.
Clean and thinly slice the mushrooms.
Heat olive oil in a pot and sauté the garlic and onion.
When the onion becomes translucent, add the mushrooms and continue sautéing.
Once the mushrooms are softened, pour in the milk and fresh cream.
Season with salt and pepper.
Simmer on low heat, stirring occasionally.
When it thickens, transfer to a bowl and serve.