In order to enjoy optimum flavour and quality, frozen items are best used within 3 months of their freezing date. Transfer to a 9×9 square dish lined with parchment paper so that there is overhang on each side, and smooth down. Add vegan chocolate chips and fold them in. The brownies will keep in an airtight container for up to 5 days. The moment I placed these brownies in the oven, I started whining like a disgruntled teenager because Luise had persuaded me to only sweeten them with dates. Transfer the black bean mix to a mixing bowl and add all purpose flour, cocoa powder, sugar, baking powder, salt and instant coffee and mix into a thick batter. Cool for 20 mins in the tin, then transfer to a wire rack to cool completely.

Bake on the middle shelf of the oven for 18-20 mins until the top is set and the mixture no longer wobbles when the tin is shaken but is still quite soft in the centre.Dollop spoonfuls of the mixture onto the brownie mixture and swirl with a cocktail stick or knife. If it's too thick to swirl, loosen with ½ tsp oil. Mix the peanut butter with the icing sugar in a small bowl.Add the eggs one at a time, beating vigorously with a wooden spoon or silicone spatula after each one. Stir until the ingredients are thoroughly incorporated. Then add the cocoa powder, sea salt, baking powder and espresso powder. Scrape the mixture into the prepared baking tin and gently smooth the top. Remove the pan from heat and stir in the sugar. Add the eggs and yolk, one at a time, pulsing until just combined. Sift in the cocoa powder, baking powder and salt, then pulse until thoroughly combined.Blitz the beans, sugar, oil and vanilla extract in a food processor until very smooth. Stir brownie mix into black bean mixture until batter is smooth fold in 1/2 cup chocolate chips. Blend black beans and water together in a blender until smooth pour into a bowl. Rinse the beans very well and drain on kitchen paper to remove the excess water. Preheat oven to 350 degrees F (175 degrees C).Grease a 22cm square baking tin with oil and line the base with nonstick baking paper. Preheat the oven to gas 4, 180☌, fan 160☌.

Brownies made with black beans