Preheat oven to 350F and line baking sheets with parchment paper.
Whisk together mashed bananas, sugar, vegetable oil, vanilla and egg in a large bowl . In a separate bowl, whisk together together flour, baking powder, baking soda, ground cinnamon, and salt.
Add the flour mixture to wet mixture and stir until combined.
Stir in the chocolate chips.
Using a cookie scooper or small ice cream scoop, scoop large tablespoons full of dough and drop onto cookie sheet, about 2 inches apart. The cookie batter will be very wet and sticky. You won't be able to handle it with your hands.
Bake for approximately 10 minutes or until lightly brown and firm.
Let cookies finish cooling on wire rack before eating.