Step 1: Prepare the Crust : Preheat your oven to 325°F (165°C) and line an 8x8-inch baking pan with parchment paper, leaving some overhang for easy removal. In a bowl, mix graham cracker crumbs, sugar, cinnamon, and melted butter until the mixture resembles wet sand. Press firmly into the bottom of the prepared pan to form an even crust. Bake for 8–10 minutes, then remove and let cool while preparing the filling.

Step 2: Make the Cheesecake Filling : In a large bowl, beat cream cheese, granulated sugar, and brown sugar together until smooth and creamy (about 2 minutes). Add eggs, one at a time, beating just until combined. Mix in vanilla extract, cinnamon, and nutmeg. Pour the cheesecake filling evenly over the cooled crust and smooth the top with a spatula.

Step 3: Prepare the Apple Topping : In a skillet over medium heat, melt butter. Add diced apples, brown sugar, cinnamon, lemon juice, and a pinch of salt. Cook for 5–6 minutes, stirring occasionally, until apples soften and the mixture becomes syrupy. Remove from heat and cool slightly. Spoon the apple mixture evenly over the cheesecake layer.

Step 4: Bake the Bars : Bake in the preheated oven for 35–40 minutes, or until the center is just set (it should jiggle slightly). Remove from the oven and let cool to room temperature. Once cooled, refrigerate for at least 3 hours, or overnight, until fully chilled and firm.

Step 5: Add Caramel Drizzle and Serve : Once the bars are chilled, drizzle generously with caramel sauce. Sprinkle with sea salt (optional) for a salted caramel twist. Slice into squares using a sharp knife, wiping between cuts for clean edges.