This apple cinnamon coffee cake is a comforting treat that's perfect for fall. The cake is moist and fluffy, with a layer of cinnamon-spiced apples running through the middle and on top. The streusel topping is made with brown sugar, cinnamon, and butter, giving it a crunchy texture and a rich, buttery flavor. This coffee cake is perfect for a cozy weekend breakfast or a Thanksgiving brunch.