Cook the fettuccine according to package instructions; drain and set aside.
In a large skillet, melt 2 tablespoons of butter over medium heat.
Add the minced garlic and sauté for 1-2 minutes until fragrant.
Add the shrimp to the skillet, seasoning with salt and pepper.
Cook the shrimp for about 3-4 minutes, or until they turn pink.
Remove the shrimp from the skillet and set aside.
In the same skillet, add the remaining butter and heavy cream.
Bring the mixture to a gentle simmer, stirring frequently.
Gradually whisk in the Parmesan cheese until the sauce is smooth.
Return the shrimp to the skillet, mixing them with the sauce.
Add the cooked fettuccine to the skillet, tossing to coat evenly.
Garnish with fresh parsley before serving.