Preheat oven to 350 F. Line a 9 inch or 8 inch square baking dish with parchment paper. Lightly grease pan and paper.
2. In a food processor fitted with the S blade, process the black beans to break them down.
Add, the almond butter, cacao powder, flax flour, vanilla, cinnamon, sugar, vinegar, salt and baking soda. Process mixture and scrape down the sides a few times. Add a little bit of water at a time (usually less than ¼ cup) until you have a smooth batter. Gently stir in the chopped walnuts
4. Pour mixture into the prepared pan. Top with the 9 half walnut pieces and bake in oven.
Bake for 25-30 depending on the size of the pan you are using. Check at 25 mins and see if it needs more cooking time.
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