Preheat the oven to 360 degrees F/180 degrees C.
In a large bowl, mix the flour, cocoa powder, baking powder, sugar, and salt. Stir well.
In a blender, process the bananas, eggs and olive oil until smooth.
Mix the wet ingredients with the dry ingredients. The dough should have a creamy consistency. if it turns out too thick add a little water.
Place the parchment paper on the bottom of a small round cake shape (8 inches, 20 cm diameter), then pour the dough. Smooth out it with a spatula.
Bake for 40 minutes.
Check with a toothpick that the cake is ready. Remove from the oven. Let it cool.
At this time, prepare the ganache.
Make a shot of espresso. Melt the chocolate in the double bath. Turn the heat off, add an espresso with milk. Mix well.
Pour the ganache on the cake starting from the middle, level with a spatula. Let it sit until the ganache is firm.
I love to serve with coconut yogurt and fresh strawberries.
Keep the cake in a fridge.