**Making the Cookie Crust:**
1. In a large bowl, whisk together the flour, brown sugar, and salt.
2. Cut in the cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
3. In a small bowl, whisk together the egg yolk and 2 tablespoons of ice water. Add this mixture to the flour mixture and stir until just combined. Add more ice water, 1 tablespoon at a time, if needed, until the dough comes together.
4. Divide the dough into three equal portions. Flatten each portion into a disc, wrap in plastic wrap, and refrigerate for at least 30 minutes.
5. Preheat your oven to 350°F (175°C).
6. On a lightly floured surface, roll out one disc of dough into a rectangle slightly larger than your baking dish (approximately 9x13 inches). Transfer the dough to the baking dish, pressing it gently into the bottom. Trim any excess dough.
7. Repeat with the remaining two discs of dough, placing them on baking sheets lined with parchment paper. Dock the dough with a fork (poke holes all over) to prevent it from puffing up during baking.
8. Bake the cookie crust in the baking dish for 15-20 minutes, or until lightly golden brown. Bake the other two cookie crust layers on the baking sheets for 12-15 minutes, or until lightly golden brown.
9. Let all the cookie crust layers cool completely before assembling.
**Making the Cream Cheese Layer:**
1. In a large bowl, beat the softened cream cheese with an electric mixer until smooth and creamy.
2. Add the powdered sugar and vanilla extract and beat until well combined.
3. Gradually add the heavy cream and beat until the mixture is light and fluffy.
**Making the Pecan Pie Filling:**
1. In a medium bowl, whisk together the melted butter, brown sugar, and corn syrup.
2. Add the beaten eggs, vanilla extract, and salt and whisk until well combined.
3. Stir in the pecan halves or pieces.
**Assembling the Pecan Pie Lasagna:**
1. Spread half of the cream cheese layer evenly over the baked cookie crust in the baking dish.
2. Carefully place one of the baked cookie crust layers on top of the cream cheese layer.
3. Pour half of the pecan pie filling evenly over the cookie crust layer.
4. Place the remaining baked cookie crust layer on top of the pecan pie filling.
5. Spread the remaining cream cheese layer evenly over the top cookie crust layer.
6. Pour the remaining pecan pie filling evenly over the cream cheese layer.
7. Cover the baking dish with plastic wrap and refrigerate for at least 4 hours, or preferably overnight, to allow the flavors to meld.
**Serving and Garnish:**
1. Before serving, garnish with whipped cream and chopped pecans, if desired.
2. Cut into squares and serve chilled.