Preparation Steps

• Preheat your oven to 350°F (175°C). Grease and flour a 9-inch round cake pan.
• In a medium bowl, whisk together the flour, baking powder, baking soda, cinnamon, and salt. Set aside.
• In a large bowl, beat the butter and sugar with an electric mixer on medium speed until light and fluffy. Add the eggs one at a time, beating well after each addition. Stir in the sour cream and vanilla extract.
• Gradually add the dry ingredients to the wet ingredients, mixing just until combined. Fold in the diced apples.
• Pour the batter into the prepared cake pan, smoothing the top with a spatula. Sprinkle additional cinnamon on top if desired.
• Bake for 40-45 minutes or until a toothpick inserted into the center comes out clean.
• Allow the cake to cool in the pan for about 15 minutes before transferring it to a wire rack to cool completely.