Apple squares, desserts similar to small apple pies, make an ideal way to use excess apples from your backyard tree or home orchard. This recipe yields approximately 16 to 20 apple squares, which can be served as a light snack or dessert. Using sour cream gives the treats a rich, tangy flavor. The apples provide vitamin C, potassium and plenty of insoluble fiber that helps improve digestion. Make several batches and freeze them for later if you have apples that must be used quickly.
Preheat the oven to 350 degrees.
Combine the flour, light brown sugar and butter in a large mixing bowl. Beat with an electric mixer on low speed until crumbly.
Add the chopped walnuts to the flour and sugar mixture and stir well until the ingredients are thoroughly combined.
Pour 2 3/4 cups of the crust mixture into the baking pan, and then press into the bottom with your fingers to form an evenly-layered crust.
Add the ground cinnamon, nutmeg, baking soda, salt, sour cream, vanilla extract and egg to the remaining flour and nut mixture. Blend until well incorporated.
Chop the Granny smith apples and add them to the cinnamon mixture. Stir well to combine.
Spread the apple mixture evenly over the prepared crust. Place the pan in the oven and bake for 25 to 35 minutes, or until a toothpick placed in the center comes out clean.
Remove the pan from the oven, allow to cool completely and cut into squares. Top with whipped cream just before serving or serve plain.