Step 1: Prepare the Graham Cracker Crust

Preheat your oven to 350°F. In a food processor, pulse the graham crackers until they form fine crumbs. Add the softened butter, brown sugar, and salt, then pulse until the mixture resembles wet sand and holds together when pressed. The texture should be slightly moist so it can be molded properly. Press this mixture firmly into the bottom of your 9-inch springform pan, creating an even layer that extends slightly up the sides.

Step 2: Create the Creamy Filling

In the same food processor (no need to clean it), combine the softened cream cheese, lemon juice, eggs, sweetened condensed milk, vanilla, salt, and brown sugar. Blend until completely smooth and creamy, stopping to scrape down the sides as needed. The mixture should be completely lump-free – this is crucial for achieving that silky cheesecake texture we are after.

Step 3: Assemble and Bake

Pour the filling over your prepared crust, using a spatula to smooth the top. Gently tap the pan on the counter to release any air bubbles. Bake for 35-40 minutes, or until the center is almost set but still slightly jiggly. The edges should be lightly golden and pulling away slightly from the pan sides.

Step 4: Prepare the Marionberry Topping

While the cheesecake is baked, combine the marionberries, lemon juice, salt, and sugar in a medium saucepan over medium heat. In a small bowl, whisk the cornstarch with water to create a smooth slurry. Bring the berry mixture to a gentle simmer, then slowly stir in the cornstarch slurry. Continue cooking, stirring constantly, until the mixture thickens to a jam-like consistency, about 5-7 minutes.

Step 5: Cool and Top

Remove the cheesecake from the oven and let it cool at room temperature for 20 minutes. Once the marionberry topping has cooled slightly, spread it evenly over the cheesecake surface. Refrigerate for at least 2 hours, though overnight chilling produces the best texture and flavor development.

Step 6: Serve and Enjoy

Run a knife around the edges of the pan before releasing the springform sides. Use a sharp knife dipped in warm water and wiped clean between cuts for the most beautiful slices. Serve chilled and watch as your guests experience that perfect moment when the creamy filling meets the burst of marionberry flavor.