Preheat Oven to 350 degrees , line a baking sheet with parchment paper and mash bananas with a fork
Blend together butter and both sugars until fluffy, about 3 minutes
Add Banana , egg and vanilla . Blend well
Add flour salt, baking soda and cornstarch. Blend until mixed well
Fold in oats until incorporated
Fold in chocolate chips
Scoop dough onto a parchment lined cookie sheet
Bake in a preheat 350 degree oven for 11-13. Let cool for 4-5 minutes and transfer to a cooling rack.
Video
Notes
If you like your cookies a little crisper I would bake them to 13 minutes , but watch them since all ovens are different . Nutritional information is estimates and can greatly differ in cookie methods and making cookies a different size .