Crust:

3 c. all-purpose flour
1/2 tsp. salt
1 c. shortening
1 egg yolk
1/2 c. milk

Combine flour and salt, cut in shortening until mixture resembles coarse crumbs. Combine egg yolk and milk; add to flour mixture. Stir just until dough clings together. Divide dough in half. On lightly floured surface, roll half of dough into a 15x10-inch rectangle. Transfer to a greased 15x10x1-inch baking pan. Set aside.

Filling:

1-1/2 c. sugar
1/4 c. (1/2 stick) butter, melted
2 tbsp. all-purpose flour
1 tsp. cinnamon
1 tsp. apple pie spice

In a bowl, toss together filling ingredients; spoon over pastry in pan. Roll out remaining dough to another 15x10-inch rectangle. Place over filling. Brush with egg white.

Bake at 375°F for 40 minutes until golden brown. Cool on wire rack.

Frosting:

1 egg white, lightly beaten
1/2 c. confectioners' sugar
2 to 3 tsp. water

Combine confectioners' sugar and enough water to achieve a drizzling consistency. Drizzle over warm pastry. Cut into squares. Serve warm or cold.

Yield 20 to 24 bars.