Preheat the oven to 350 degrees.
Grease a large bread pan.
In a large bowl, mix all of the dry ingredients together.
In a medium bowl, whisk together mashed bananas, eggs, honey, yogurt, and vanilla.
Combine wet and dry ingredients. Mix together and fold in the walnuts.
Pout batter into the greased pan and bake for 50-60 minutes, until center is firm.
Let cool and serve!