Preheat your oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan to ensure your cake won’t stick.

In a large bowl, whisk together the flour, granulated sugar, brown sugar, baking powder, baking soda, cinnamon, nutmeg, and salt until everything is well combined.

Add the softened butter, eggs, and buttermilk to the bowl with the dry ingredients. Mix everything together until you have a smooth batter.

Gently fold in the chopped apples, allowing them to distribute evenly throughout the batter.

Pour the batter into your prepared baking pan, spreading it out evenly to ensure even baking.

Place the pan in the preheated oven and bake for 30-35 minutes. The cake is done when a toothpick inserted into the center comes out clean.

Once baked, allow the cake to cool slightly. Before serving, top it with the apple pie filling for added sweetness and flavor.

This coffee cake is best served warm. For a cozy touch, you can add a dollop of whipped cream or a scoop of vanilla ice cream on the side.