Preheat the oven to 350°F (175°C) and grease a muffin tin or line with muffin liners.

In a mixing bowl, whisk together the flour, baking soda, and salt.

In another bowl, combine the mashed bananas, granulated sugar, brown sugar, vegetable oil, egg, and vanilla extract until smooth.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Spoon the batter into the prepared muffin tin, filling each cup about 2/3 full.

Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center comes out clean.

Allow to cool in the tin for a few minutes before transferring to a wire rack to cool completely.