Preheat oven to 350°F (175°C). Line a 9×13-inch (23×33 cm) baking pan with parchment paper, leaving an overhang for easy removal. Lightly coat with cooking spray.
cooking spray
Start with the crust, combining flour and brown sugar in a medium bowl. Cut in the butter until crumbly, then press the mixture evenly into the pan. Bake for 15 minutes, or until lightly browned.
2 cups (240g) all-purpose flour, ½ cup (100 g) packed light brown sugar, 1 cup (226 g) butter
Make the filling. In a large mixing bowl, beat cream cheese and sugar until smooth. Add eggs one at a time, mixing well after each. Stir in vanilla. Spread the cheesecake filling over the warm crust.
3 (8 oz / 226 g each) packages cream cheese, ¾ cup (150 g) granulated sugar, 3 large eggs, 2 tsps (10 ml) vanilla extract
Prepare the apples. In another bowl, stir together chopped apples, sugar, cinnamon, and nutmeg. Spread the apple mixture evenly over the cheesecake filling.
3 (~ 450 g) Granny Smith apples, 2 tbsps (25 g) granulated sugar, ½ tsp (1 g) ground cinnamon, ½ tsp (1 g) ground nutmeg
Mix the streusel. Combine brown sugar, flour, oats, and butter until crumbly. Sprinkle the streusel evenly over the apples.
1 cup (200 g) packed light brown sugar, 1 cup (120 g) all-purpose flour, ½ cup (40 g) quick-cooking oats*, ½ cup (113 g) butter
Bake the bars. Return the pan to the oven and bake for 40–45 minutes, or until the cheesecake layer is set and the topping is golden.
Finish with caramel. Cool on a wire rack until room temperature. Chill for at least 1 hour, then drizzle with caramel sauce before serving.
½ cup (102 ml) caramel sauce