Banana cake is a great and simple way to use up your overripe bananas. The softer and riper the better. Actually, for this cake I used four very black bananas, as black and disgusting that my first instinct dictated to throw them away. Lucky, we are in lockdown and we recycle and reuse mostly everything. Tips: Use light brown sugar and good quality olive oil for the best result. Easy, healthy, vegan glazing at the top: 100g oat cream mixed with 100g peanut butter.