Prepare the apples by coring, peeling, and dicing them. To prevent oxidation, coat the apples in fresh lemon juice and set aside.

In a large saucepan, combine the brown sugar, granulated sugar, cornstarch, cinnamon, and nutmeg. Add water and whisk until all ingredients are dissolved. Bring the mixture to a boil over medium-high heat.

After reducing the heat slightly, allow the mixture to simmer for 2 minutes. Add the apples, return to a boil over medium-high heat, and then reduce to low. Simmer for 10-12 minutes, or until the apples are softened and the sauce has thickened.

Remove from heat and allow the mixture to cool to room temperature.

Melt the butter over medium heat in a saucepan. Once melted, incorporate the brown sugar until it is fully dissolved.

Introduce the vanilla extract, cinnamon, and chopped pecans, stirring continuously.

Lower the heat and integrate the quick-cooking oats, cooking for an additional 2 minutes, ensuring that all ingredients are thoroughly combined.

Reserve approximately 1/3 to 1/2 cup of the oat-pecan mixture for later use. The remainder should be pressed into the base of a 9 x 13-inch dish, previously greased, and then refrigerated until firm.

Using an electric mixer, blend the cream cheese, butter, and vanilla extract until smooth. This should take approximately 2 minutes.

Gradually incorporate the powdered sugar until the mixture is uniform. Subsequently, fold in the whipped cream.

Spread this mixture uniformly over the previously prepared crust and refrigerate.

Once the apple pie filling has reached room temperature, spread it over the cream cheese layer and return to the refrigerator until set.

Layer the dessert with 2 1/2 to 3 cups of whipped cream, ensuring a smooth surface.

Drizzle the caramel sauce over the whipped cream layer. For aesthetic purposes, use a wooden skewer or the back of a knife to create swirls in the whipped cream using the caramel.

Finish by sprinkling the reserved oat mixture on top and garnishing with additional pecans.

For best preservation, store the dessert in the refrigerator.