Step 1: Gather your ingredients.
Step 2: Preheat the oven to 350°F (175°C).
Step 3: Mash the bananas in a large bowl until smooth.
Step 4: Mix in melted butter, eggs, and vanilla extract.
Step 5: In a separate bowl, whisk together flour, baking soda, and brown sugar.
Step 6: Gradually add dry ingredients to wet mixture, stirring gently.
Step 7: Fold in chocolate chips or nuts.
Step 8: Prepare the baking pan.
Step 9: Pour the batter into the prepared pan.
Step 10: Bake for 50-60 minutes or until a toothpick comes out clean.
Step 11: Let cool, then slice and enjoy!