Preheat the oven to 180°C.Grease a bundt pan (I used a Wiltshire Rose Gold Round Fluted Bundt Mould 21cm) with Cake goop or a light layer of butter or margarine
Sift the flour, baking powder, and salt into a large bowl.Using an electric mixer cream together the butter and sugar until fluffy. A couple of minutes should do it.
On a low speed, add one egg at a time, followed by 2-3 tablespoons of the flour mixture. Mixing this way helps to prevent curdling. Repeat until the eggs and flour have been combined.Then add the vanilla and milk and mix in
Remove just over half of the batter to another bowl. Set aside, this will be the vanilla- pale part of the Marble cake
To the batter that remains, add the cocoa powder and mix in until combined- This batter will form the dark/chocolate part of the marble cake.
We are now going to layer the batters (4 layers). Dollop a quarter of the vanilla batter into the prepared bundt pan, then a quarter of the chocolate batter, then the Vanilla again and finally dollop 4 blobs of chocolate batter on top(See video above)
Next, give the bundt pan a little jiggle so the batter can move into all the grooves of the Bundt pan, then tap the bundt pan on your kitchen worktop a couple of times to level the batter out.
Place the cake pan into the oven and bake for 35 minutes, or until a cake skewer comes out clean.
Once the cake is baked allow it to rest for 5-10 minutes, before gently turning it out onto a wire rack
Once the cake has cooled completely, make the chocolate glaze
To make the chocolate glaze, mix together the icing sugar, cocoa powder, milk and vanilla extract, until you have a thick gloopy consistency. Pour over the surface of the cake allowing it to drip down the sides
Leave the glaze to set at room temperature for around 15 minutes before serving.