Preheat oven to 350 degrees F.
Line cookie sheets with parchment paper.
In the bowl of an electric stand mixer, mix the butter, sugar, and banana until combined.
Add in the egg and vanilla extract.
Once combined, add in the dry ingredients; flour, oats, flour, salt, baking soda, cinnamon, and nutmeg. Mix in chocolate chips.
Using a cookie scoop, drop cookies onto lined cookie sheets, making sure they are about 2 inches apart.
Bake for 10-12 minutes until edges are light brown. Cool.
Make sure to check out LilMissCakes for gorgeous cakes and desserts.