Preheat oven to 350 degrees. Mash bananas with a fork or masher in a large mixing bowl. Add oil, egg, sugar, and vanilla and whisk until combined.
In a separate bowl, whisk together dry ingredients, then slowly add them to the wet and stir until just combined.
Pour batter into a greased loaf pan and bake for 45-50 minutes. Bread may not look quite done in the middle, but take it out anyway. Let cool completely in the pan, then remove and slice.
Recipe by Eating Made Easy at https://eating-made-easy.com/banana-yogurt-bread/