Preheat oven to 350 degrees. Gather ingredients so that you have everything close at hand on the counter or table.
In a large mixing bowl, combine white cake mix, sour cream, water and large eggs. Beat on medium high for 3 minutes.
Spread the batter into a greased baking sheet or jelly roll pan.
Drop pie filling in 15 spoonfuls, dividing the filling evenly over the batter.
Bake in preheated oven for 25-30 minutes until the cake springs back when touched. Allow to cool.
Prepare the Glaze
While the cake is cooling, prepare the icing. In a small bowl combine the powdered sugar, whole milk, and almond extract. Mix together with a whisk until smooth.
Spread the glaze over the cooled cake and sprinkle with sliced almonds. Serves 15