Preheat oven to 350°F. Line a baking sheet with parchment paper.

In a large bowl, combine melted butter, sugar, mashed bananas, and vanilla extract. Mix well.

Add the flour gradually to the wet mixture, stirring until just combined.

Stir in chocolate chips.

Drop spoonfuls of dough onto the prepared baking sheet.

Bake for 10-12 minutes or until edges are golden brown.

Remove from oven and allow to cool on a wire rack before serving.