I got this off the internet, but I don't remember the site, but it is delicious, easy, and tastes just like Olive Garden.

Olive Garden Fettucine Alfredo

1 stick of unsalted butter, softened
Dash of pepper
2 cups heavy cream
1 cup italian shredded cheese
1 cup freshly grated parmesan cheese

In a saucepan, warm the heavy cream over med. heat (do not boil). Add the pepper and the softened butter and continue warming until it is completely melted. Add the cheeses last and stir until thick and melted. Pour over your pasta. I promise you will never have to go to Olive Garden for Fettucine Alfredo again!