1. Preheat your oven to 350°F (180°C). Grease a 9-inch springform pan with cooking spray or butter.
2. In a bowl, combine the graham cracker crumbs and melted butter until well mixed. Press the mixture into the bottom of the prepared pan and bake for 10 minutes. Let it cool.
3. In a large mixing bowl, whisk together the eggs, granulated sugar, sour cream, heavy cream, softened cream cheese, and vanilla extract until smooth. Pour the mixture over the cooled graham cracker crust.
4. Bake for 50-60 minutes or until the edges are lightly golden and the center is set. Let it cool to room temperature before chilling in the refrigerator for at least 2 hours.
5. Once chilled, remove the cheesecake from the pan and slice into wedges. Place each slice on a plate and drizzle with chocolate fudge sauce. Sprinkle chocolate shavings on top (optional).
6. Serve and enjoy your delicious fudge truffle cheesecake!