This classic coffee cake recipe is a crowd-pleaser. The cake is moist and fluffy, with a layer of cinnamon streusel running through the middle and on top. The streusel is made with brown sugar, cinnamon, and butter, giving it a rich, buttery flavor. This coffee cake is perfect for breakfast or brunch, and it's easy to make ahead of time. Serve it warm with a cup of coffee for the ultimate comfort food experience.