Apple Pie Squares

I have a cookbook, The Harmony Kitchen Cookbook published by the Twin Falls Chapter of Sweet Adelines, April 1977, that Grandma Birrell gave to me. I thought that it would be nice to post all of her recipes. I am guessing at some of this because the directions are not making much sense.

Crust -
2 1/2 cups flour
1 teaspoon sugar
1 cup margarine or butter
1 egg yolk
milk

Mix cut margarine into flour and sugar. Put egg yolk in a cup and fill with milk to make 2/3 cup. Mix with fork and add to the flour mix.

Filling -
2 handfuls cornflakes
8 - 10 apples, slice
1 cup sugar
1 teaspoon cinnamon
1 egg white
powdered sugar and water

Roll 1/2 crust to fit a long cookie sheet. Crumble flakes over crust. Place sliced apples on top. Sprinkle with sugar and cinnamon. Put onto crust. Roll other 1/2 crust and place on top of apples. Spread the beaten egg white on to crust. Bake at 350 for 45 minutes to 1 hour. While warm glaze with powdered sugar and water.