About two and a half bananas
Wash the bananas and blueberries thoroughly, then mash the bananas.
In a bowl, mix the mashed bananas, blueberries, flour, sugar, baking powder, eggs, milk, and butter until well combined.
Pour the batter into a pan and bake in a 180°C oven for 30–35 minutes.
Let it cool and cut into bite-sized pieces.