Add cottage cheese, mashed banana (or just the hunks), eggs and oil to blender and blend for about 60 seconds until smooth and well combined.
Add salt, baking soda, cinnamon, and protein powder to blender, blending for about 30 seconds until incorporated. Next add pulsing in and scraping down sides of blender with spatula, as needed. Do not over blend mixture.
Depending on your sweetness preference and/or ripeness of bananas or sweetness of protein powder you may want to add 10-20 drops of liquid stevia or monk fruit. I did NOT however, and it was still nicely, lightly sweet.
Pour mixture into a standard loaf pan that has been liberally sprayed with cooking spray. If desired, sprinkle and desired topping on before baking.
Bake for 30 to 40 minutes until center set and toothpick pulls clean. Let cool in pan for 15 minutes; cut in 8 thick slices.
Store leftovers in fridge for up to 5 days. Reheat in microwave for 10 seconds.