#### 1. Prepare the apple filling:
In a large skillet over medium heat, melt the butter. Add the diced apples, granulated sugar, cinnamon, nutmeg, and lemon juice. Cook for 5–7 minutes, stirring occasionally, until the apples are softened but still hold their shape. Remove from heat and let cool completely.
#### 2. Make the caramel cream:
In a mixing bowl, beat the heavy whipping cream, powdered sugar, and vanilla extract on high speed until stiff peaks form. Gently fold in the caramel sauce until fully incorporated.
#### 3. Assemble the cake:
- Spread a thin layer of caramel cream on the bottom of a 9x13-inch baking dish.
- Arrange a single layer of graham crackers over the cream, breaking them as needed to fit.
- Spread 1/3 of the caramel cream over the graham crackers.
- Add 1/3 of the apple filling evenly over the cream layer.
- Repeat the layers (graham crackers, caramel cream, apple filling) two more times, finishing with a layer of caramel cream.
#### 4. Chill:
Cover the dish with plastic wrap and refrigerate for at least 6 hours, preferably overnight, to allow the flavors to meld and the graham crackers to soften.
#### 5. Serve:
Before serving, drizzle with additional caramel sauce. Cut into squares and serve chilled.