In a large bowl, mash up your bananas and measure out 1 cup. Add in neutral oil, vanilla extract, and granulated sugar, and mix until combined.
Add in the flour, baking soda, baking powder, salt, and cinnamon, and mix together until it has the consistency of muffin batter. If you want to add chocolate chips or nuts, add them now as well.
Cover the bowl and let it sit on the counter for 1 hour. During this time, preheat your oven to 350°F.
When the dough is ready, scoop out 2-tbsp sized spoonfuls and drop onto a parchment paper lined pan. You should get 17-18 cookies.
Bake for 9-12 minutes. 9 minutes will produce a much softer cookie, 11-12 will be more firm around the edges. Either way you do it, make sure to let them rest on the pan to continue cooking and firming up for around 10 minutes after removing from the oven.
Eat and enjoy!