Preheat the oven to 350°F. Lightly grease a loaf pan or line it with parchment paper.
In a medium bowl, whisk together flour, baking soda, salt, and 1 tsp of ground cinnamon.
In a separate bowl, mash ripe bananas until relatively smooth. Stir in melted butter (or oil), granulated sugar, vanilla extract, and eggs until well combined. Gently fold the dry ingredients into the wet mixture. Avoid overmixing to keep the bread tender. The batter should be thick but pourable.
Pour the batter into the prepared loaf pan. Sprinkle the cinnamon-sugar mix generously over the top for a signature snickerdoodle crust.
Place the pan on the center rack of your preheated oven. Bake for about 50 minutes, or until a toothpick inserted into the center comes out clean. If the top browns too quickly, tent it with aluminum foil during the last 10 minutes.
Remove from the oven and allow the bread to cool in the pan for about 10 minutes. Transfer to a wire rack to cool completely before slicing. Enjoy warm or at room temperature.
Notes
If you prefer a sweeter crust, increase the cinnamon-sugar mix slightly.
Make sure bananas are fully ripe (brown-speckled) for the best flavor and moisture.