Shrimp Fettuccine Alfredo

"This is a very simple recipe and it tastes divine! My sister and I were trying to come up with the perfect Alfredo recipe and we found it."
Ingredients 
Original recipe makes 6 servings
 1 pound fettuccini pasta
 1 tablespoon butter
 1 pound cooked shrimp - peeled and deveined
 4 cloves garlic, minced
 1 cup half-and-half
 6 tablespoons grated Parmesan cheese
 1 tablespoon chopped fresh parsley

 salt to taste

Directions

1. Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain.
2. In a large skillet, cook and stir shrimp and garlic in the butter for about one minute. Pour in half and half; stir. Sprinkle Parmesan cheese in one tablespoon at a time, stirring constantly. After all Parmesan is added, mix in parsley and salt. Stir frequently making sure it does not boil. Sauce will take a while to thicken.
3. When sauce has thickened, combine with cooked pasta noodles; serve hot.