Heat oven to 350°F (180°C) and fold a 8 inches (20 cm) metal loaf pan with parchment paper or grease it with oil.
In a large bowl, mash the bananas then combine with Greek yogurt, egg, maple syrup, ground cinnamon, vanilla extract and a pinch of salt. Stir well until you get a smooth mixture.
Add into the wet mixture almond flour and baking powder. Stir the ingredients together. You may need to adjust with little extra flour if the batter is too liquid, or with a splash of milk if it is too dry. This depends on the size of the bananas used.
Transfer your almond flour banana bread batter to the prepared pan, then bake in hot oven for about 35-42 minutes. The loaf is ready when a toothpick inserted into its center comes out clean.
Let cool for at least 30 minutes before serving.