Preheat oven to 350F; line the bottom and long sides of a 9x5x3 inch loaf pan with parchment paper; lightly coat with cooking spray
Whisk the flour, baking soda and salt together in a bowl; whisk the bananas, sugar, yogurt, oil and vanilla together in a different bowl; fold the wet ingredients into the dry ingredients with a spatula until the batter comes together
Transfer the batter to the loaf pan; bake for 55-60 minutes until a toothpick comes out clean; tent the loaf pan with foil if the top browns too quickly
Cool the bread in the pan on a wire rack for 30 minutes then lift out by the parchment paper