Preheat the oven to 350°F. Line a 9-inch loaf pan with parchment paper then grease the paper lightly with cooking spray.
In a large bowl, whisk together the flour, sugar, brown sugar, baking soda and salt.
In a blender jug, combine the bananas, eggs, cottage cheese, olive oil and vanilla extract. Blend until smooth, about 2 minutes. (The mixture will be thick.)
Add the wet ingredients to the dry ingredients and stir until combined. (The batter will be thick.) Stir in the chopped nuts or chocolate chips (optional) then scrape the batter into the prepared loaf pan.
Bake the bread until a toothpick inserted comes out clean, 50 to 60 minutes. (If the top is getting too brown but the center still isn’t baked, tent the loaf with foil at the 45-minute mark and continue baking as needed.)
Remove the bread from the oven and allow it to cool before slicing and serving.