Preheat oven to 350 degrees F. Spray a 9 by 5 inch loaf pan well with cooking spray, set aside.
In a large bowl, whisk together the flour, cinnamon, baking soda, and salt.
In a medium bowl, mash the bananas until smooth. Add the butter, eggs, yogurt, sugar, and vanilla. Mix until completely smooth and combined.
Pour the wet ingredients into the dry ingredients. Add 3/4 cup of the chocolate chips, gently fold together until just mixed. Do not overmix the batter.
Pour the bread batter into the prepared pan. Sprinkle remining 1/4 cup of chocolate chips on top. Bake for 55 minutes or until a toothpick inserted into the bread comes out with just a few crumbs.
Allow the bread to cool in the pan for 10 minutes, then remove to a cooling rack and continue to cool for at least 30 minutes before slicing.