01 - Bring a large pot of salted water to a rolling boil. Cook fettuccine according to package directions until al dente. Reserve 1/2 cup of the pasta cooking water, then drain the pasta and set aside.
02 - While the pasta is cooking, melt the butter with the olive oil in a large skillet over medium heat. Add the finely chopped shallot and sauté for approximately 2 minutes, or until it becomes translucent.
03 - Introduce the minced garlic and sliced morel mushrooms to the skillet. Continue to cook, stirring periodically, for 5 to 7 minutes, until the mushrooms are tender and aromatic.
04 - Pour in the heavy cream and bring the mixture to a gentle simmer. Stir in the grated Parmesan cheese, freshly ground black pepper, and salt. Allow to cook for 2 to 3 minutes, or until the sauce thickens slightly.
05 - Add the drained fettuccine to the skillet with the sauce. Toss gently to ensure the pasta is evenly coated. Incorporate reserved pasta water, a little at a time, as necessary to achieve a smooth, silky sauce consistency.
06 - Taste the dish and adjust the seasoning as needed. Remove the skillet from the heat.
07 - Divide the prepared pasta among individual serving plates. Finish each portion with a drizzle of white truffle oil and a sprinkle of chopped fresh parsley.