Preheat the oven to 180°c (160 fan/ Gas 4/ 350F) and line a 30 x 20 cm brownie tin with baking paper.
Place the grated courgettes in a sieve above the sink to let any excess water drip out.
300 g Grated Courgette
Melt the butter and chocolate in the microwave. I microwave for 20 seconds at a time and then stir the mixture. This ensures the chocolate doesn't burn or seize. Leave to cool.
150 g Unsalted Butter, 200 g Dark Chocolate
In another bowl, whisk the eggs and sugars together for 2-3 minutes (using an electric whisk). You want the mixture to be pale and fluffy.
3 Eggs, 100 g Caster Sugar, 100 g Light Brown Sugar
Mix the cooled melted chocolate mixture into the whisked eggs and sugar.
Stir in the grated courgette and vanilla extract.
300 g Grated Courgette, 1 tablespoon Vanilla Extract
Fold in the flour, cocoa powder, baking powder, and chocolate chips. make sure everything is well mixed.
140 g Plain Flour, 2 tablespoon Cocoa Powder, 1 teaspoon Baking Powder, 100 g Milk Chocolate Chips
Spoon the mixture into the baking tin and bake for 30 minutes. Cool completely before cutting and serving.