Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish or line it with parchment paper.

In a medium bowl, combine the graham cracker crumbs, melted butter, and 2 tablespoons of granulated sugar. Mix until evenly moistened and press the mixture into the bottom of the prepared baking dish to form the crust. Set aside.

In a large mixing bowl, beat the cream cheese, 1/2 cup granulated sugar, and 1/4 cup brown sugar until smooth and creamy. Add the eggs, one at a time, mixing well after each addition. Stir in vanilla extract, ground cinnamon, and ground nutmeg until fully combined.

Spread the cream cheese mixture evenly over the graham cracker crust in the baking dish.

In another bowl, toss the diced apples with a small amount of ground cinnamon (optional) and evenly distribute them over the cream cheese layer.

To make the streusel topping, combine the flour, oats, 1/4 cup brown sugar, and cold cubed butter in a bowl. Use a pastry cutter or your fingers to mix until crumbly. Sprinkle the streusel evenly over the apples.

Bake in the preheated oven for 35-40 minutes, or until the center is set and the topping is golden brown.

Remove the bars from the oven and allow them to cool completely at room temperature. Then refrigerate for at least 2 hours to set.

Before serving, drizzle the caramel sauce generously over the bars. Cut into squares and enjoy!