Preheat oven to 375 degrees F and line 2 cookie sheets with unbleached parchment paper or silicone baking mats.
In a large bowl, add oat flour, oats, sugar, baking powder, baking soda, salt and chocolate chips. Stir with spatula and set aside.
In another medium bowl, mash banana and add milk, oil and vanilla extract. Whisk, transfer to a bowl with dry ingredients and stir until well mixed.
Using medium size ice cream scoop or large spoon, scoop batter on previously prepared baking sheets leaving 2 inches in between.
Bake for 12 minutes or until the edges of cookies are lightly brown. Let cool for 10 minutes and enjoy!
Notes
Store: Store in a cool dry place uncovered for 2 days. After store in a ventilated container for up to 2 more days. It's best not to stack these cookies on top of each other as they get soggy.
Freeze: Bake, cool cookies completely, place in a resealable plastic bag or container and freeze for up to 3 months. Thaw on a counter for a few hours.
Oats: You can use quick cooking oats, cookies will have less texture. No steel cut oats please. However, I believe quick cooking steel cut oats can be used.
Cookie texture: These cookies spread a bit, have crunchy edges and softer middle. Because they do not contain hardly butter or oil, they are not as chewy as regular ones but they are also much healthier.
No liquid sweetener: You have to use dry sweetener otherwise recipe will not work. No maple syrup or honey.