This recipe is for an impossibly easy banana bread coffee cake. It consists of a cake layer made from mashed bananas, sugar, milk, oil, cinnamon, eggs and biscuit mix, with sliced bananas folded in. A streusel topping is made from biscuit mix, nuts and brown sugar cut together with butter. The cake is baked for 30-36 minutes until a knife inserted comes out clean, then cut into squares and served with optional maple syrup. The instructions also provide directions for making it ahead by refrigerating the unbaked cake up to 12 hours before baking.