This gluten free Nutella cake is a chocolate lover's dream! A light and airy gluten free Nutella sponge with the fluffiest Nutella frosting ever. This recipe makes 16 squares in a 24cm square tin and can be kept for 3-5 days in a sealed container.
Preheat the oven to 180'C / Gas 160'C / Gas Mark 4. Line a 24cm square tin with baking paper and set to one side.
Add the caster sugar, vegetable oil, buttermilk and eggs to a mixing bowl and beat with an electric whisk until they combine to form a very thin batter. Don't worry about any curdling at this stage - the flour will fix this!
Mix the gluten free self-raising flour, baking powder, xanthan gum and cocoa powder in a separate bowl and then sift into the wet mixture. Add the Nutella to the mixture and then beat again with the electric whisk until fully combined. This should form a thick, chocolatey cake batter.
Pour the batter into the lined cake tin, smooth out and bake for 20-25 minutes until the tops bounce back when gently pushed (or a skewer inserted in the middle comes out clean). Remove the cake from the oven and cool completely before decorating.
To make the frosting, beat the butter, Nutella, icing sugar and milk with an electric whisk until it is thick and fluffy. Spread in a thick layer over the cake and then decorate with the melted chocolate and chopped nuts. Cut into 16 squares and serve.
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Notes
I always use FREEE by Dove's Farm flour - using a different brand may produce slightly different results and different gluten free flours absorb moisture at different rates.
If you don't have self-raising flour, use 175g of plain gluten free flour plus 3 tsp of baking powder instead of the quantities given above.
This cake will keep in a sealed container for around 3-5 days. It can also be frozen.