This apple cinnamon streusel cake recipe is perfect for those who love a crunchy topping. The cake is moist, fluffy, and bursting with apple and cinnamon flavors. The streusel topping is made with flour, sugar, cinnamon, and butter. To make this cake, you'll need flour, sugar, baking powder, salt, cinnamon, eggs, oil, vanilla extract, apples, and butter. 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 sprinkle the streusel topping over the batter. Bake for 35-40 minutes. Serve warm with a scoop of vanilla ice cream.