Pre-heat oven to 170°C fan forced. Grease & line a 20 x 20 cm square tin with baking paper.
Into the bowl of a food processor, add the lentils, honey, coconut oil and brown sugar. Blend until well combined. Next add the cocoa powder, plain flour, salt, baking powder and vanilla. Blend for a further 20 seconds to combine. Finally add the eggs and blend for another 30 seconds.
Stir in chocolate chips and walnuts. Pour mixture into the prepared tin. Sprinkle top with a few extra chocolate chips.
Bake for 30-35 minutes until the edges are firm and middle still slightly fudgy.
Allow to cool completely before cutting into squares.