Make the Crust
Preheat the oven to 350°F (175°C).
Mix graham cracker crumbs, melted butter, sugar, and cinnamon.
Press into a 9x13-inch pan and bake for 10 minutes. Let cool.
Prepare the Cheesecake Layer
Beat cream cheese and sugar until smooth.
Add eggs one at a time, then stir in vanilla.
Pour over the crust.
Apple Layer
Toss apples with lemon juice, brown sugar, cinnamon, and nutmeg.
Spread over the cheesecake layer.
Streusel Topping
Mix flour and brown sugar. Cut in cold butter and add pecans.
Sprinkle over apples.
Bake and Cool
Bake for 45–50 minutes. Cool, then chill for 2 hours.
Caramel Sauce
Heat sugar and water until amber-colored.
Whisk in cream, then stir in butter and salt.
Serve
Slice bars and drizzle with caramel sauce before serving.