1. Preheat your oven to 375°F (190°C) and line a 9×13 inch baking pan with parchment paper.
2. In a medium bowl, mix together the flour, granulated sugar, and salt. Add the chilled butter and use a pastry cutter or your fingers to blend until the mixture resembles coarse crumbs.
3. Gradually add the ice water, one tablespoon at a time, mixing until the dough begins to come together. Wrap in plastic wrap and refrigerate for at least 30 minutes.
4. While the dough chills, prepare the filling by combining the sliced apples, brown sugar, cinnamon, nutmeg, lemon juice, and cornstarch in a large bowl. Set aside.
5. Roll out half of the dough to fit the bottom of the prepared pan. Press it evenly into the pan and prick with a fork.
6. Pour the apple mixture over the crust, spreading it out evenly.
7. Roll out the remaining dough and place it over the apple filling. Seal the edges and cut slits on top for venting.
8. Brush the top with beaten egg and sprinkle with coarse sugar if desired.
9. Bake for 45-50 minutes, or until the crust is golden brown and the apples are tender.
10. Remove from the oven and let cool before slicing into bars.

As you bake, let the scents transport you to a cozy place, perhaps reminding you of a bustling kitchen filled with family and laughter. That’s the magic of cooking.