Preheat oven to 350 degrees F. Line a baking sheet with parchment paper.
Whisk together oat flour, sugar, baking soda, cinnamon and salt in a large bowl. Add in tahini and egg, and fold until mixture becomes a dough. Then fold in chocolate chips.
Cover and place in the fridge for 30 minutes.
Use a cookie scoop to form 12 round balls and place on a baking sheet evenly throughout. Bake for 12 minutes. When you remove the cookies from the oven, immediately sprinkle flake salt on top. And if you want to get a perfectly round cookie, turn a large glass upside down to cover the cookie then lightly swirl around the glass to make the cookie perfectly round! Let cookies cool for 5 minutes before transferring to a cooling rack.