Preheat oven to 350°F and grease a 9x5-inch loaf pan
In a mixing bowl, mash the bananas. Add melted butter and mix well.
Stir in baking soda and salt. Mix in sugar, egg, and vanilla extract.
Gradually add the gluten-free flour and mix until just combined.
Fold in any optional mix-ins
Pour the batter into the prepared loaf pan and bake for 50-60 minutes or until a toothpick inserted comes out clean.
Allow the banana bread to cool before slicing and serving.
Notes
Store leftover banana bread in an airtight container at room temperature for up to 3 days or in the refrigerator for longer freshness.You can customize this banana bread by adding chocolate chips, nuts, or dried fruits. For a dairy-free version, substitute the butter with coconut oil.