Apple Dessert Squares

1 package (18.25 oz.) butter pecan cake mix
3 tablespoons margarine, melted
1 tablespoon water
4 cups thinly sliced, peeled Apples
2 tablespoons flour
1/2 teaspoon apple pie spice
1 can (14 oz.) sweetened condensed milk
Vegetable cooking spray
 

Thoroughly combine cake mix, margarine and water. Press evenly and firmly into bottom of 13 x 9 x 2-inch baking pan coated with cooking spray.  Bake at 350 degrees F about 10 minutes or until very lightly browned. Combine Apples, flour and spice. Arrange evenly over hot crust. Pour condensed milk over Apples.  Return to oven and bake 50 minutes longer or until milk is golden brown and Apples are tender. Cool completely before serving.