Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large bowl, whisk together mashed bananas, melted butter, brown sugar, and granulated sugar until smooth.
Stir in the egg and vanilla extract until fully combined.
In another bowl, whisk the flour, baking soda, salt, and cinnamon.
Gradually mix the dry ingredients into the wet ingredients until just combined—don’t overmix!
Fold in the chocolate chips like you mean it.
Drop spoonfuls of dough onto the baking sheet, spacing them about 2 inches apart.
Bake for 10–12 minutes, or until the edges are golden and the centers look just set.
Let the cookies cool on the sheet for 5 minutes before transferring to a wire rack. Or eat one immediately. No judgment.