Preheat your oven to 350°F (175°C). Grease and line an 8×8-inch square baking pan with parchment paper or non-stick spray.

1. In a large bowl, mash the ripe bananas until smooth.
2. Stir in the melted butter, brown sugar, and vanilla extract until well combined.
3. Beat in the eggs, one at a time, mixing well after each addition.
4. In a separate bowl, whisk together the flour, baking powder, and salt.
5. Gradually fold the dry ingredients into the wet mixture, stirring until just combined. Be careful not to overmix.
6. If using, fold in the chocolate chips and chopped nuts.
7. Pour the batter into the prepared pan and spread it evenly with a spatula.
8. Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
9. Let the blondies cool in the pan for 10 minutes, then transfer them to a wire rack to cool completely before slicing into squares.