Preheat the oven to 180°C (356°F).
Mash the banana well and place it in a bowl.
Add eggs and mix well.
Add almond flour, cocoa powder, baking powder, and salt. Mix until combined.
Pour the batter into the baking pan and smooth the top.
Bake in the 180°C (356°F) oven for 20-25 minutes.
Let it cool, then cut into desired sizes.