Preheat oven to 350°F (180°C).
Line a 9‑inch (23 cm) cake pan with parchment and lightly grease the sides.
Mash the bananas until smooth.
Add the eggs and mix until glossy.
Add cottage cheese, cocoa powder, agave syrup and baking powder; mix until combined.
Let the batter rest for 3–5 minutes.
Pour into the pan, tap to release air bubbles and smooth the top.
Bake for 40 minutes until set with moist crumbs.
Cool 15–20 minutes, then remove and cool completely or chill before slicing.