Start by peeling and mashing 2 ripe bananas in a bowl until smooth with just a few small lumps.
In a large mixing bowl, cream together ½ cup softened butter, ½ cup brown sugar, and ¼ cup granulated sugar until light and fluffy.
Beat in the mashed bananas, 1 teaspoon vanilla extract, and 1 large egg until well combined and smooth.
In a separate bowl, whisk together 1½ cups all-purpose flour, 1 teaspoon baking soda, and ½ teaspoon salt.
Gradually add the dry ingredients to the wet mixture, stirring gently until just combined—avoid overmixing.
Fold in 1 cup of chocolate chips evenly throughout the dough.
Preheat oven to 350°F (175°C). Line baking sheets with parchment paper or a silicone mat. Scoop rounded tablespoons of dough onto sheets, spacing about 2 inches apart.
Bake cookies for 10-12 minutes, until edges are golden but centers still look soft. Let cool on sheets for 5 minutes, then transfer to a wire rack to cool completely.