Preheat oven to 180°C/ 350°F/ 165° FF and prepare your chosen pan/pans (I'm using a large loaf tin, but you can use a bundt tin, circle tins or 2 smaller loaf tins). Grease and line loaf tin with baking paper.
In the bowl of a stand mixer, combine the dry ingredients
In a small jug, combine the buttermilk, eggs, oil and vanilla
Add the buttermilk mixture from the jug to the dry ingredients, then mix on medium-high for 2 minutes, until light and fluffy
Gently stir through the boiling water, until combined. The mixture will be very thin
Pour mixture into prepared tin and bake for 40-50 minutes (depending on tin size), or until a cake tester comes out clean
Cool in the pan for 10 minutes, then turn onto a cake rack to cool completely