This apple cinnamon coffee cake recipe is perfect for breakfast or brunch. It's a delicious and comforting cake that pairs well with a cup of coffee or tea. The cake is moist, fluffy, and packed with apple and cinnamon flavors. To make this cake, you'll need flour, sugar, baking powder, salt, cinnamon, eggs, oil, vanilla extract, apples, and sour cream. Mix the dry ingredients in one bowl and the wet ingredients in another. Then, combine the two mixtures and fold in the chopped apples. Pour the batter into a greased baking pan and bake for 35-40 minutes. Serve warm with a dusting of powdered sugar or a dollop of whipped cream.