PEEL and DEVEIN shrimp; SET aside in ice.

MELT butter in a heavy skillet over medium-high heat.

ADD shrimp and garlic, COOKING and STIRRING for 3-5 minutes.

REMOVE shrimp and set aside, reserving garlic and butter in skillet.

ADD half and half to skillet; bring to a BOIL, STIRRING constantly.

REDUCE heat to low and SIMMER about 15 minutes, or until thickened, STIRRING occasionally.

Meanwhile, COOK pasta according to package directions (typically, add to 2 quarts boiling water and cook for about 4 minutes).

ADD shrimp, parsley, and seasonings to sauce; STIR until blended and warm.

DRAIN pasta when at "al dente" and SERVE warm, in individual portions, covered with shrimp and sauce.