½ cup unsalted chilled butter, cut into 1-inch pieces
4 cups peeled and sliced apples (about 2-3 large apples)
2 tablespoons fresh lemon juice
1 teaspoon ground cinnamon
1 egg, lightly beaten
1/3 cup evaporated milk
1 teaspoon vanilla extract
¾ cup chopped walnuts
1 1/3 cups flaked coconut
Preheat the oven to 375 degrees. Lightly spray a 13×9-inch baking pan with pan spray.
In the bowl of a food processor, add the flour, 1/3 cup sugar, and salt. Pulse once quickly to combine. Add the butter pieces and pulse again until the butter is fully incorporated and you have a fine, dry crumb mixture.
Pour the crumb mixture into the prepared baking pan and press into an even layer in the bottom of the pan. (Don’t worry about the crumbs looking too dry in the pan – it will bind together as it bakes.)
In a bowl, combine the apple slices and lemon juice and stir to combine. Arrange the apple slices in rows on top of the crumb mixture. Sprinkle the apples with any remaining lemon juice left in the mixing bowl.
In a small bowl, combine 1/3 cup sugar with the cinnamon. Mix well and then sprinkle the mixture over the apple slices.
Bake in the oven for 20 minutes.
While the pan is in the oven, in a medium sized bowl, mix together the remaining 1/3 cup sugar, egg, milk, vanilla, walnuts and coconut until well combined. Spoon over the partially baked apple crumb mixture and spread as evenly as possible.
Bake for another 20-25 minutes or until the topping is lightly golden brown.
Allow to cool slightly, then cut into squares while still warm. Allow to cool completely before serving.