Cook pasta according to package directions. Meanwhile, saute mushrooms and onion in oil in a large skillet until tender. Add garlic; cook 1 minute longer., Add the shrimp, broth and seasonings. Bring to a boil. Reduce heat; cook and stir for 4-5 minutes or until sauce is slightly thickened and shrimp turn pink., Stir in the tomatoes, 1/4 cup cheese and butter. Drain pasta; toss with shrimp mixture. Sprinkle with remaining cheese.