Preheat and Prep

• Preheat your oven to 325°F (163°C).
• Line a 9×13-inch baking pan with parchment paper, leaving an overhang on the sides for easy removal.

2. Make the Crust

• In a medium bowl, combine graham cracker crumbs, melted butter, and granulated sugar. Mix until the crumbs are evenly moistened.
• Press the mixture firmly into the bottom of the prepared pan.
• Bake for 10 minutes, then let cool slightly while preparing the cheesecake layer.

3. Prepare the Cheesecake Filling

• In a large bowl, beat the cream cheese with a hand mixer or stand mixer until smooth and creamy.
• Add the granulated sugar and mix until well incorporated.
• Beat in the eggs, one at a time, mixing well after each addition.
• Stir in the vanilla extract and sour cream, mixing until smooth.

4. Assemble the Cheesecake Layer

• Pour the cheesecake mixture over the cooled crust. Spread it evenly to the edges using a spatula.

5. Prepare the Nutella Swirl

• In a microwave-safe bowl, combine Nutella and heavy cream.
• Microwave in 20-second intervals, stirring until smooth and pourable.
• Drop spoonfuls of the Nutella mixture over the cheesecake layer.
• Use a knife or toothpick to create swirls, gently spreading the Nutella for a marbled effect.

6. Bake

• Bake in the preheated oven for 35–40 minutes, or until the center is set and the edges are lightly golden.
• Remove from the oven and let cool to room temperature.

7. Chill and Serve

• Refrigerate the bars for at least 3 hours, or overnight, to set completely.
• Once chilled, lift the bars out of the pan using the parchment overhang.
• Cut into squares and serve. Garnish with additional Nutella drizzle or powdered sugar if desired.