Cook fettuccine in a large saucepan of boiling salted water according to packet instructions. Drain, reserving 1 cup of the cooking water and set aside

Place butter, garlic, mushrooms and bacon into a large microwave-safe bowl. Select 100% power and dial up 5 minutes; Press START button

Stir and add cream; return to microwave and select 100% power and dial up 5 minutes. Press START button

Stir in half the parmesan and toss through hot fettuccine, along with enough hot cooking water to loosen up the sauce. Season to taste with salt and pepper

Serve topped with extra parmesan