1-First Step: Prepare the crust: Combine 2 cups graham cracker crumbs, 1/2 cup melted unsalted butter, and a pinch of salt in a medium bowl. Stir until the mixture resembles wet sand. Press firmly into the bottom of the prepared pan using the back of a measuring cup for an even layer. Bake for 10 minutes until lightly golden. Let it cool for 5 minutes while you mix the filling. This short bake sets the crust without over-browning.

2-Second Step: Make the cheesecake filling: In a large bowl, beat 24 oz softened cream cheese with 1 cup granulated sugar using a hand mixer on medium speed for 2 minutes until smooth and lump-free. Add 3 large eggs one at a time, mixing just until combined after each. Beat in 1 tsp vanilla extract and 1/4 cup heavy cream. Scrape down the sides to ensure even mixing. Avoid overbeating to prevent excess air, which can cause cracks.

3-Third Step: Add Nutella to the filling: Gently fold in 1/4 cup Nutella until swirled throughout the batter, leaving some streaks for visual appeal. Pour the filling over the cooled crust, spreading evenly with a spatula. Tap the pan on the counter a few times to release air bubbles.

4-Fourth Step: Create the Nutella swirl: Warm the remaining 1/4 cup Nutella in the microwave for 10-15 seconds until pourable. Dollop spoonfuls over the cheesecake filling. Use a butter knife or skewer to swirl in a zigzag pattern across the surface, creating that marbled look without overmixing. This step takes about 2 minutes and makes the bars extra pretty.

5-Fifth Step: Bake the bars: Bake at 325°F for 40-45 minutes. The edges should be set, but the center will still jiggle slightly, like Jell-O. Turn off the oven, crack the door, and let the bars cool inside for 1 hour. This gradual cooling prevents sinking or cracking. Then, refrigerate for at least 4 hours or overnight for the best texture.

6-Final Step: Finishing touches and serving: Lift the bars out using parchment overhang, cut into squares with a sharp knife dipped in hot water for clean edges. Garnish with chopped hazelnuts, sea salt flakes, or a dusting of cocoa powder. Serve chilled. They taste even better the next day as flavors meld. Total time: 20 minutes prep, 45 minutes bake, 4+ hours chill. Store extras as noted below.