Bring a large pot of salted water to a boil. Add the 12 oz fettuccine pasta and cook according to package instructions until al dente, usually around 10-12 minutes. Reserve a cup of pasta water before draining to adjust your sauce consistency if needed. Drain the pasta and set aside.
Heat 2 tablespoons of olive oil in a large skillet over medium-high heat. Add the peeled and deveined shrimp in a single layer. Season lightly with salt and pepper. Cook for about 2 minutes on each side until the shrimp turn pink and opaque. Remove the shrimp from the skillet and set aside.
In the same skillet, add the minced garlic. Sauté for about 30 seconds to 1 minute until fragrant—be careful not to burn the garlic as it will turn bitter.
Lower the heat to medium and pour in the 1 cup of heavy cream. Stir frequently and let it come to a gentle simmer. Slowly add the 1 cup of grated Parmesan cheese, stirring constantly until the cheese melts and the sauce thickens. If the sauce becomes too thick, add a little reserved pasta water to loosen it.
Return the cooked shrimp to the skillet and toss to coat with the Alfredo sauce. Add the drained fettuccine and gently toss everything together until the pasta is evenly coated with the creamy sauce.
Taste and adjust seasoning with salt and pepper as needed. Sprinkle freshly chopped parsley over the top for a pop of color and fresh flavor.