Cook pasta according to package directions. Drain and set aside.
In the meantime, heat 1tbsp butter in a saute pan; add onions and garlic, cook until onions turn translucent, about 5-6 minutes.
Next add the mushrooms and cook until tender, about 6 minutes.
Lower the heat and add cream and milk. Next add chipotle sauce and cook until the sauce thickens, about 3-4 minutes.
Add pasta to the cream sauce, cook for 2 minutes. Season with salt and pepper.
Garnish with parsley and serve hot.