In a mixing bowl combine butter and sugar until fluffy.
Add eggs and bananas and mix well.
Blend in sourdough discard, yogurt, and lentils, and vanilla.
In a separate mixing bowl combine dry ingredients. Slowly stir into wet ingredient mixture.
Grease two loaf pan with baking spray and divide mixture between the two.
Bake for 50-60 minutes, or until a toothpick comes out clean. Allow the bread to cool in the pan or 10 minutes and then flip out onto a cutting board and allow it to cool for another 10 minutes before slicing and smothering in butter.
Notes
This recipe can be baked as muffins too! It will yield 2 dozen. The only change is the bake time - they'll wrap up in about 25-30 minutes. Do the same toothpick test to check that they are done.