Pre-heat the oven to 160C Fan/180C/350F/Gas Mark 4 and grease and line a 2lb loaf tin
In a large mixing bowl, stir together the self raising flour, wholemeal flour, baking powder, bicarbonate of soda, cocoa powder and coconut sugar until well combined
Grate the courgette and squeeze it over the sink to release any extra liquid, then add it to the bowl along with the dark chocolate chips, stir everything together
In another bowl or large jug, whisk together the eggs, vegetable oil, vanilla extract and yoghurt
Pour the egg mixture into the bowl of flour/courgette etc and stir everything together until well combined
Pour the mixture into the loaf tin and bake for 1 hour and 10 minutes, or until a skewer inserted in the centre comes out clean (I would suggest checking it after 1 hour). Leave to cool fully
To decorate, melt the dark chocolate in the microwave. To do this, blast it for 30 seconds, stir, then blast in 10 second bursts stirring in between each one until melted. Drizzle it over the cake
Store leftovers in an airtight continer in a cool place and eat within 3 days
Video
Notes
Make sure all your ingredients (particularly the eggs) are at room temperature before you start baking.
For the best flavour, make sure to use a good quality vanilla extract and not an essence. You can also use a vanilla bean paste.
I used coconut sugar to make this cake, it's a great option if you're avoiding refined sugars. However you can use light brown soft sugar or caster sugar if you prefer instead.
You can swap the plain wholemeal flour for regular plain flour if you prefer.
Or if you can only find self raising wholemeal flour, then you can omit the baking powder.
You will need a 2lb loaf tin for this recipe (you can test the size of your loaf tin by seeing how much water the tin can hold, 2lb will hold about 2 pints/1100ml of water). If you have a 1lb loaf tin, simply halve the ingredient amounts.
Although I provide cup measurements, I highly recommend weighing your ingredients out using digital kitchen scales. It is the most accurate way to measure ingredients and will ensure the best results. Digital scales are very low cost and can be purchased for around £12 ($16.50) .
For teaspoon (tsp) and tablespoon (tbsp) measurements, please use measuring spoons and not the type of spoons you eat with. Again this will ensure accuracy and provide the best results.