COOK pasta as directed on package. Meanwhile, heat oil in large skillet. Add mushrooms, onion and garlic; cook and stir until tender.
BRING half-and-half just to a boil in nonstick saucepan on medium heat. Reduce heat to low; simmer 5 minutes. Add Gorgonzola cheese, Parmesan cheese and sherry; cook until sauce is thickened, stirring frequently.
DRAIN pasta; place in large bowl. Add cheese sauce; toss to coat. Top with mushroom mixture.