01 - Bring a large pot of generously salted water to a rolling boil. Cook the fettuccine or spaghetti according to package directions until al dente. Before draining, reserve ½ cup of the pasta cooking water. Drain the remaining water.
02 - In a large skillet over medium heat, melt the unsalted butter with the olive oil. Add the minced garlic and sauté for 1 to 2 minutes, until aromatic but not browned.
03 - Pour in the heavy cream and bring the mixture to a gentle simmer. Cook for 3 to 4 minutes, stirring occasionally, until slightly thickened.
04 - Stir in the grated Parmesan cheese, salt, freshly ground black pepper, and red pepper flakes (if desired). Continue mixing until the cheese has fully melted and the sauce achieves a smooth consistency.
05 - Add the drained pasta directly to the sauce in the skillet, tossing gently to ensure every strand is thoroughly coated. If the sauce appears too thick, gradually incorporate the reserved pasta water, a tablespoon at a time, until the desired velvety consistency is achieved.
06 - Remove the skillet from the heat. Add the chopped fresh parsley and toss to combine.
07 - Serve the Creamy Garlic Pasta immediately, garnished with additional grated Parmesan cheese and extra chopped parsley.