Add all the wet ingredients — cottage cheese, mashed bananas, eggs, Greek yogurt, honey (or sweetener), melted coconut oil, and vanilla — to a blender or mixing bowl. Blend or whisk until completely smooth, creamy, and well combined. Make sure no lumps of cottage cheese remain for the smoothest banana bread texture.
In a separate large bowl, whisk together the oat flour, almond flour, protein powder, baking powder, baking soda, cinnamon, and salt until the mixture looks even and there are no clumps.
Pour the wet mixture into the dry ingredients. Use a spatula to fold gently until just combined. Do not overmix — stopping when the batter is uniform helps keep the banana bread soft and moist instead of dense or rubbery.
Pour the batter into a loaf pan lined with parchment paper. Smooth the top with a spatula, and if desired, add banana slices, nuts, or chocolate chips on top for extra texture and flavor.
Bake at 350°F (175°C) for 45–55 minutes, or until a toothpick inserted in the center comes out clean with a few moist crumbs. The top should be golden and the loaf should feel springy to the touch.
Let the banana bread cool in the pan for 10–15 minutes, then lift it out using the parchment paper and transfer it to a cooling rack. Allow it to cool fully before slicing to help it set properly and maintain its shape. Enjoy warm or room temperature.