Saute garlic and onion in olive oil over medium heat; add mushrooms as the aroma develops. Add chicken stock and wine and cook until mixture is reduced to 1/2 volume. Blend in cream and reduce to desired thickness. Season with salt and pepper to taste.
Meanwhile cook pasta in a large pot of boiling salted water until al dente.
Drain pasta and toss with sauce until coated. Serve on small warmed plates, topped with grated Parmesan cheese and parsley.