Preheat the Oven: Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking pan to prepare for your cake.
Cream the Butter and Sugar: In a large mixing bowl, cream together the softened butter and sugar until light and fluffy. This step adds air to the cake, making it wonderfully tender.
Add Eggs and Other Wet Ingredients: Beat in the eggs one at a time, mixing well after each addition. Then, stir in the sour cream and vanilla extract.
Combine Dry Ingredients: In a separate bowl, mix the all-purpose flour, baking powder, baking soda, salt, and ground cinnamon together, ensuring they are well combined.
Mix Everything Together: Gradually add the dry ingredients to the butter mixture, stirring until just combined to avoid overmixing, which can make the cake dense.
Fold in Apple Pie Filling: Gently fold in the apple pie filling, ensuring it’s evenly distributed throughout the batter.
Bake: Pour the batter into the prepared baking pan and spread it evenly. Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
Cool and Serve: Allow the cake to cool slightly before slicing. Enjoy it warm or at room temperature!