Cinnamon Apple Slab Pie

Preheat your oven to a medium-high temperature of 350 degrees Fahrenheit or 175 degrees Celsius.

Combine 1 and a half cups of all-purpose flour, one and a half tablespoons of granulated sugar, baking powder, and a pinch of salt in a spacious mixing container. Use your fingers or a pastry blender to break down the ½ cup of cold butter into small pieces, resulting in a mixture that resembles coarse crumbs. In a separate bowl, whisk together the egg yolk and water until they are fully incorporated; then add this mixture to the flour mixture and blend until a dough forms. Roll out the dough to fit the dimensions of a 10x15-inch baking pan.

In another large bowl, combine sliced apples and a squeeze of fresh lemon juice; add 1 and three-quarters cups of white granulated sugar, two tablespoons of all-purpose flour, and a pinch of ground cinnamon. Pour the filling mixture into the pie crust and dot the top with 2 tablespoons of cold butter.

In a medium-sized bowl, combine one cup of all-purpose flour, two-thirds cup of brown sugar, and a pinch of ground cinnamon. Use your fingers or a pastry blender to break down the 2/3 cup of cold butter until it becomes crumbly; then sprinkle this mixture evenly over the apples.

Place the pie in the preheated oven and bake until the topping is golden brown, approximately one hour.