Preheat oven to 350 degrees.
Spray 13x9 or similar baking pan with non-stick cooking spray.
In a large bowl, cream butter and sugar.
1 cup unsalted butter, softened, 2 cups white granulated sugar
Add eggs, one at a time, beating well after each addition.
4 eggs
Stir in vanilla.
1 teaspoon pure vanilla extract
In a small bowl, combine flour and salt.
3 cups all-purpose flour, 1 teaspoon salt
Add to creamed mixture.
Evenly spread about 3 cups of dough into baking pan.
Spread pie filling over batter evenly.
2 cans
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 ingredients for Glaze - NOTE: if you add the vanilla the glaze is a bit darker, if you want the glaze to be bright white, use clear vanilla extract.
1 cup powdered sugar, 2-3 tablespoons milk or cream, ¼ teaspoon vanilla extract
Drizzle over bars.
Cut and serve.