Olive Garden's Fettucini Alfredo

I'm not sure if this is really an Olive Garden original (I got the recipe from my friend Marisa), but whatever it is, it is YUM! I've tried so many different Alfredo recipes and I must say this is my favorite. Simple, bursting with flavor and not shy on the calories, a definite must for alfredo :)

1/2 C real butter
1 tsp fresh garlic
1 dash cayenne pepper
1 pint heavy whipping cream
2/3 cup fresh grated parmesan or romano cheese
salt and pepper to taste
1 lbs pasta
chopped fresh parsley for garnish (opt)
In a saucepan over medium-low heat, melt butter--add cream, garlic, and salt and peppers. Simmer for 20-30 minutes, stirring constantly until thickened. Remove sauce from heat and stir in cheese. Serve over hot pasta and seasoned grilled chicken.