1Cook and drain pasta as directed on package; cover to keep warm.
2Meanwhile, in 12-inch nonstick skillet, melt butter over medium-high heat. Cook onion in butter 8 to 10 minutes, stirring occasionally, until soft and golden. Add mushrooms, chopped sage and thyme; cook until mushrooms are tender, about 5 minutes. Stir in whipping cream, cheese, salt and pepper.
3Pour sauce over cooked pasta; toss gently to coat. Garnish with herbs.