Preheat the oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper.
Add the bananas, cottage cheese, eggs, melted butter (or oil), sugar, and vanilla extract to a blender, food processor or use an immersion blender, to blend until smooth.
In a separate bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon.
Pour the wet mixture into the dry ingredients and gently stir until combined.
Fold in the chopped nuts.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake for 50-60 minutes, or until a toothpick inserted in the center comes out clean.
Allow the bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Notes
Make sure your bananas are very ripe. The riper, the sweeter and more flavorful your banana bread will be.
Don’t overmix the batter—stir until just combined to keep the bread from being tough.
If you like a lighter loaf, use vegetable oil instead of butter.
Add-ins like nuts or chocolate chips should be folded in gently to avoid overmixing the batter.