Preheat oven to 160C fan forced. Grease or line 30 x 20 cm slice tin with baking paper. In a large bowl, whisk together coconut oil, sugar, vanilla and egg until smooth. Stir chocolate chips through mixture.
Gently fold flour and cocoa through the wet ingredients, mix until just combined. Don't be concerned if the mixture is looking dry as the zucchini will sort this out.Add the zucchini and stir through. Let it sit for a few minutes.Stir zucchini and chocolate mixture again until well combined.Pour mixture into prepared slice tin.Bake slice for 25 minutes, or until just cooked through.Cool in tin. Makes 20.