Wash blueberries and raspberries thoroughly.
Combine oat flour, whole wheat flour, and baking powder in a bowl and mix well.
Add almond milk, erythritol, and vanilla extract to make the dough.
Fold the berries into the dough.
Place parchment paper on a pan and pour the dough over it.
Bake in a preheated oven at 180°C for 20-25 minutes.