Preheat oven to 350°. Spray Baking Pam in a 13 x 9- inch baking pan.

In a large bowl, on the medium speed of an electric mixer, cream the butter with the granulated sugar until smooth, about 2 minutes. Add eggs, one at a time, beating well after each addition. Add the vanilla. Add the flour and mix thoroughly.

Spread the dough evenly in the prepared pan. With a small, sharp knife (or toothpick), score into twenty-four 2-inch squares. Place a teaspoon of pie filling in the center of each scored square. Bake for 30 - 35 minutes, or until a cake tester inserted in the center of the pan comes out clean. Cool to room temperature, then sprinkle with confectioner's sugar before cutting and serving.