Cream butter; add sugar and beat well.
Beat in eggs one at a time.
Add vanilla.
Gradually stir in sifted dry ingredients.
Spread 3/4 of dough in a lightly grease 8x11 inch baking pan.
Spread apple pie filling over dough.
Spoon remaining dough over pie filling, spreading lightly. *Not all pie filling will be covered.
Bake at 375 degrees for 35-40 minutes.
Cool 15 minutes; combine drizzle ingredients and spoon over bars.