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Nanna's Rainbow Cake Recipe

Nanna's Rainbow Cake Recipe

A Sweet Slice of Nostalgia

Some recipes just feel like home — and this one is straight from Nanna’s kitchen. Soft, buttery and perfectly golden, this vanilla cake is the kind that makes you pause mid-bite and smile. We’ve given Nanna’s original recipe a modern Jellybean twist with coconut sugar, creamy buttermilk and a swirl of dreamy buttercream that’s naturally sweet and oh-so-smooth.

Whether you’re baking for a birthday, a Sunday treat, or just chasing that nostalgic “childhood kitchen” feeling, this recipe will take you there — one delicious slice at a time.

Grab your apron, cue the music, and let’s bake a little magic together. 🎂✨

Ingredients

For the Cake

  • 3 cups plain flour

  • 3 tsp baking powder

  • ½ tsp baking soda

  • ½ tsp sea salt

  • 1 cup unsalted butter, softened

  • 1¼ cups coconut sugar (finely ground if coarse)

  • 5 eggs, room temperature

  • 2½ tsp vanilla extract or vanilla bean paste

  • 1¼ cups organic buttermilk

For the Frosting

  • 300 g organic unsalted butter, softened

  • 1 cup coconut sugar, blitzed into powder (like icing sugar)

  • 2 tsp organic vanilla extract or vanilla bean paste

  • 2–3 tbsp organic cream or milk

  • 1 x 500 g bag of FUNDAY Party Mix (for decorating)


Method

1. Preheat

Preheat your oven to 170 °C (fan-forced). Grease and line your cake tins.

2. Dry Mix

In a medium bowl, whisk together the flour, baking powder, baking soda and salt. Set aside.

3. Cream Butter & Sugar

In a large bowl, beat the butter and coconut sugar until pale and creamy (about 3–4 minutes).

4. Add Eggs & Vanilla

Beat in the eggs, one at a time, until smooth and combined. Add the vanilla extract.

5. Combine

Fold in the dry ingredients in three parts, alternating with the buttermilk in two parts. Mix gently until just combined — don’t over-mix!

6. Bake

Divide the batter evenly between the prepared tins. Bake for 25–30 minutes, or until golden and a skewer inserted into the centre comes out clean.
Rest in tins for 10 minutes, then transfer to a wire rack to cool completely.


To Make the Frosting

  1. Blitz the coconut sugar into a fine powder (icing-sugar texture).

  2. Beat the butter until pale and fluffy (3–4 minutes).

  3. Slowly add the powdered coconut sugar, then vanilla and cream.

  4. Whip until light, fluffy, and smooth.


To Decorate

Spread the buttercream generously over your cooled cake layers.
Finish with a handful (or two!) of FUNDAY Party Mix for that joyful, Jellybean touch.


Tips

💫 For extra flavour, add a pinch of cinnamon or a splash of almond extract.
🎂 This recipe makes two 20 cm (8 in) round cakes.
🧁 It also works perfectly for cupcakes — just bake for 15–18 minutes.