Copycat Olive Garden Fettuccine Alfredo

Name: Copycat Olive Garden Fettuccine Alfredo
Ingredients: 1 pound dry fettuccine pasta; 1/2 cup unsalted butter; 1 teaspoon grated garlic (from about 2 cloves); 2 tablespoons all-purpose flour; 2 1/2 cups heavy cream; 1 1/2 cups shredded Parmesan cheese (5 ounces); 1 teaspoon salt; 1/2 teaspoon black pepper; Chopped fresh parsley (optional)