Preheat oven to 350. Line an 8×8 baking dish with parchment paper or spray well with cooking spray.
In a large bowl combine oat flour, cocoa, baking powder + baking soda, and vanilla bean powder. Pour in date puree. Mix together until evenly combined. Fold in chocolate chips and stir.
Spread brownie mixture in prepared baking dish. Bake for 20 minutes. Remove from oven, let cool on a wire rack, slice, and serve with banana ice cream for a fully vegan dessert!