In a larger mixing bowl, combine the vegetable oil, brown sugar, and mashed banana. Mix well.
Add the egg yolk and vanilla extract. Again, mix well
add the flour, salt, baking soda and cinnamon. Stir until combined.
folk in the chocolate chips.
Line a cookie sheet with parchment paper or spray cooking oil on a cookie sheet.
Preheat oven to 350 degrees.
Use a cookie scoop or a spoon to scoop out 1 inch dough balls. Place them 2 inches apart on the cookie sheet.
Bake for 11-12 minutes or until the edges begin to brown and the cookies have puffed up but the middles are still slightly unbaked.
Remove from oven and placed the cookies on a cooling rack and allow to cool before eating!