Step 1: Preheat your oven to 350°F (175°C) to ensure even baking.
Step 2: Line your muffin tin with parchment paper or muffin liners.
Step 3: Mash the very ripe bananas in a large mixing bowl until smooth.
Step 4: Mix in the softened butter and brown sugar, then add the eggs and vanilla extract.
Step 5: In another bowl, whisk together the flour, baking soda, baking powder, and salt.
Step 6: Fold the dry ingredients into the wet mixture until just combined.
Step 7: Fill each muffin cup about two-thirds full with the batter.
Step 8: Bake for 18-20 minutes, or until a toothpick inserted comes out clean.
Step 9: Allow the muffins to cool in the pan for about 5 minutes before transferring to a wire rack.
