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Chocolate Brownie Layer Cakes with Rainbow Buttercream

Let’s bake the world a better place!

I'm super proud to have been asked to be an Ambassador for the Raise Dough fundraising campaign for the incredible Reach Out organisation. Reach Out do an amazing job providing resources and supporting young Aussies living with mental health difficulties.

Raise Dough is all about dusting off your aprons, doing some and hosting hosting a bake sale, selling to your workmates or friends, having your mates over for dinner, or sell batches of your signature bake online. All money raised goes to supporting the work of Reach Out.

The brief for me was about chocolatey and colourful .... so these easy to make brownie layer cakes with rainbow buttercream are bright, fun, and super delicious

For a print friendly recipe, click here



375g Callebaut dark couverture chocolate callets (buttons) 375g unsalted butter (chopped) 250g caster sugar 100g brown sugar 6 large eggs (free range always) 1 tsp good quality vanilla extract 250g plain flour

RAINBOW BUTTERCREAM 4 cups pure icing sugar 250g unsalted butter 2 tablespoons good quality vanilla extract up to 1⁄4 cup milk (if necessary)



Preheat oven to 180°C.

Melt chocolate and butter together in microwave or in bowl over simmering pan of water.

Add caster sugar and brown sugar, gently whisking til combined. Add eggs, lightly beaten, gently whisking til combined.

Add vanilla.

Fold through flour til combined.

Pour into 2 x baking paper lined baking pans, (around 24cm x 35cm)

Cook at 180 Deg C, for 15 mins, until desired baked consistency. (when a skewer is inserted in the middle, it comes out with sticky crumbs on it, not just liquid).

Cool in pan.


Beat softened butter with paddle attachment on stand mixer, or using hand held mixer or whisk by hand.

Add icing sugar 1⁄2 cup at a time, ensuring icing sugar is fully incorporated with butter before adding more, to ensure a non grainy texture.

Towards the end, add vanilla, and if necessary, add a little milk to reach a softer consistency if butter cream seems too thick to pipe smoothly.

Divide buttercream into four equal bowls, and colour with food colouring to achieve desired colour. I’ve used blue, pink, yellow and green.

Place a star nozzle piping tip in a piping bag.

Place each colour of buttercream in separate piping bags, and pipe a strip of each colour in the new piping bag that has the star nozzle in it, piping from the nozzle end to 2/3 of the way up the bag. Twist the end and tension piping bag, and multi coloured buttercream should appear when piping! Alternatively, pipe each colour along a piece of cling wrap, and roll up the cling wrap like a sausage, snip the end, and place inside a piping bag with a start nozzle on it!


Using a cookie cutter, cut rounds of cooled brownie.

Using a star nozzle in a piping bag, pipe butter cream onto brownie rounds, and stack on top of each other as desired.

Place Persian fair floss on top, and sprinkle with colourful candy sprinkles if desired.



The best quality chocolate you can afford



Fair Trade certified or chocolate that has been been ethically & sustainably sourced



Read more, in 'frequently asked questions'

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