Preheat oven to 350°
Spray 15 X10 X 1 baking pan with non-stick cooking spray.
In a large bowl, cream together butter and sugar.
Add eggs, one at a time, beating well after each addition.
Stir in vanilla.
In small bowl, combine flour, baking powder and salt. Add to creamed mixture.
Spread 3 cups of dough into baking pan.
Spread pie filling over batter evenly.
Drop remaining batter by teaspoon over the top.
Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean. Cool on rack.
Combine powdered sugar, milk or cream and vanilla extract to make glaze. Drizzle over bars.
Cut and serve. Store leftovers in air tight container.