Preheat the oven to 180C or 350F. Line a baking tray with baking paper.
In a medium bowl, mix the oat flour and baking soda, until well combined.
In a large bowl, mix the almond butter, coconut oil, flax eggs, maple syrup, and vanilla, until well combined.
Fold the wet ingredients into the dry mixture and combine.
Stir in the chopped dark chocolate.
Roll tablespoon-sized amounts of dough into balls and flatten slightly on the lined baking tray. You should have enough dough for about 10 cookies.
Bake cookies for 9-12 minutes and remove when the edges begin to turn a golden brown. The cookies may look a little underdone, but they will continue to cook once you remove them from the oven.
Allow the cookies to cool down on the baking sheet for 5 minutes before transferring to a cooling rack.