In a small bowl, mix flax seed and water together and let sit for 5 minutes until gel forms. Prep the other ingredients while waiting.
In small blender, grind quick oats into flour. Add coconut flour, baking soda, and salt to blender cup. Stir to combine and set aside.
In a medium bowl, whisk together nut or seed butter, coconut sugar, and softened coconut oil until combined. (You can use an electric hand mixer, just make sure your lowest setting is slow and not too powerful.) Ingredients should be fully combined. If you have chunks of coconut oil, use fingers to blend in.
Add flax mixture and vanilla to bowl of wet ingredients and whisk again until combined.
Add flour mixture and stir gently with rubber spatula or wooden spoon.
Fold in chocolate chips, and shape dough into thick & flat circle, about 4" in diameter. Dough will be slightly sticky, but should still be able to shape into circle.
Place cookie dough on parchment paper on a small plate, and chill in freezer for at least 30 minutes. Preheat oven to 350F while dough is chilling.
Once cookie dough has chilled, place on lined baking sheet in oven and bake for 14-16 minutes. Edges should be golden. Middle may seem underdone, but will set when cooling.
Let cookie cool on baking sheet for AT LEAST 10 minutes before eating (or you could just eat it right away because you've already waited long enough, just don't burn yourself ;-) ).