Preheat the oven to 180°C (356°F).
In a bowl, mix oat flour, almond flour, and baking powder.
In another bowl, mix egg whites, erythritol, and vanilla extract.
Combine the dry and wet ingredients and mix thoroughly.
Add dark chocolate chips and gently mix.
Form the dough into cookie shapes.
Place them on a baking tray lined with parchment paper.
Bake in the oven at 180°C (356°F) for 12 minutes.
Let cool and enjoy.