Preheat your oven to 350°F (175°C). Prepare a muffin tin by lining it with paper liners or greasing it thoroughly with cooking spray to prevent sticking.
In a large mixing bowl, combine the mashed bananas with both the granulated and brown sugars. Mix well until the mixture is smooth and creamy.
Pour in the melted butter and stir until fully incorporated into the banana mixture.
Crack the eggs into the bowl one at a time, mixing well after each addition. Then, add the vanilla extract and continue to blend until evenly mixed.
Sprinkle the baking soda, baking powder, and salt over the wet ingredients, then stir briefly to ensure even distribution of the leavening agents.
Gradually add the sifted flour to the mixture, gently folding it in with a spatula. Mix until just combined; be careful not to overmix to keep the muffins tender.
Carefully fold in the chocolate chips and chopped nuts (if using), ensuring they are evenly mixed throughout the batter.
Using a spoon or a scoop, divide the batter evenly among the prepared muffin cups, filling each cup about two-thirds full to allow room for rising.
Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center of a muffin comes out clean, indicating they are fully baked.
Once baked, allow the muffins to cool in the pan for 5 minutes. Then, gently transfer them to a wire rack to cool completely.
Notes
Serve the muffins warm on a decorative plate, lightly dusted with powdered sugar for a touch of elegance.