A Coffee & Walnut Cake is a classic bake! It's two layers of fluffy coffee sponge dotted with chopped walnuts. I've filled and decorated it with a sweet coffee buttercream, and added more walnuts on top for decoration. I've piped the buttercream on, but you can spread it on if you prefer. This is such a yummy cake for coffee lovers and an easy recipe too. It can be made for a special occassion, or as an every day cake.

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Ingredient Tips & Equipment Information

Make sure all your ingredients (particularly the butter and eggs) are at room temperature before you start baking.
I used a baking spread for the cake and unsalted butter for the buttercream.
I used Nescafe Azera instant coffee for this recipe, you will need an instant coffee to make this cake. You can also boost the flavour with coffee extract if you like, I like Nielsen Massey's.
If you want to make this into a coffee cake, you can leave out the walnuts.
Although I provide cup measurements, I highly recommend weighing your ingredients out using digital kitchen scales. It is the most accurate way to measure ingredients and will ensure the best results. Digital scales are very low cost and can be purchased for around £12 ($16.50) .
For teaspoon (tsp) and tablespoon (tbsp) measurements, please use measuring spoons and not the type of spoons you eat with. Again this will ensure accuracy and provide the best results.

For the full recipe with measurements, head to the recipe card at the end of this post.

How to make Coffee & Walnut Cake

Start by dissolving the instant coffee into boiling water, set it aside to cool. In a large mixing bowl, mix together the butter and golden caster sugar for around 3 minutes. Add the eggs and mix in well. Then add the self raising flour and the coffee (and coffee extract if using). Finally fold in the chopped walnuts.

Divide the mixture between the cake tins. Bake for 35-40 minutes or until a thin skewer inserted in the centre comes out clean. Leave to cool completely.

To make the buttercream, first mix the coffee with boiling water and leave to cool. Mix the butter for a couple of minutes until smooth and creamy, then add the icing sugar, coffee (and coffee extract if using) and mix until smooth. Pipe it onto the first layer of cake, add the second cake layer and pipe the remaning buttercream on top. Decorate with the remaining walnuts.

For the full recipe with measurements, head to the recipe card at the end of this post.

How long does the cake last for and can you freeze it?

The cake will keep in an airtight container for 3 days in a cool place. You can freeze the sponges either alone, or decorated. Once the sponges are fully cool, wrap them well with cling film or put them in an airtight container with some baking paper between them. You can freeze the buttercream on it’s own in a tub, or you can decorate the cake and freeze it fully assembled. To do this and avoid damage to the decoration, freeze it in an airtight container. Or let it freeze solid on a cake board or plate, then wrap in cling film. Remove the cling film when you take it out to defrost it, if you don’t it could damage the apperance of the decoration as it defrosts and softens. You can also freeze slices of the cake, again well wrapped in cling film or in airtight containers.

Can this cake be made in different size cake tins?

If you would like to make this cake in different size tins, please check my Conversion Guide to find out how to adjust the recipe.

Can you make the cake with plain/all purpose flour?

Self raising flour, which is very commonly used in the UK where I am based, already contains a raising agent and a little salt too. Therefore if you want to swap it for plain or all purpose flour, you will need to add some additional baking powder and also a little salt if you like. Some people like to add salt to cake recipes and some don't, so I'll leave that up to you as it won't affect the bake. The general advice is to add 2 teaspoons baking powder (a measuring teaspoon, not the kind you stir your coffee with) per every 200g plain or all purpose flour. So for this recipe you'd need to add 3 ½ teaspoons baking powder. Please note, I have not tested this recipe using plain or all purpose flour.

Do you need an electric mixer to make this recipe?

While you can absolutely make this recipe with a wooden spoon and some elbow grease, I do recommend using an electric mixer for the best results. The cake will be lighter and fluffier when made with an electric mixer. The buttercream will also be smoother. You don't have to use an expensive stand mixer either, you can get electric hand whisks for as little as £10!

Can this cake be made gluten free?

Yes! For gluten free you can replace the self raising flour with a gluten free self raising flour blend. If you only have a gluten free plain flour blend, you will need to add additional baking powder. The general advice is to add 2 tsp baking powder per 200g flour, so for this recipe you'd need to add 3 ½ teaspoons baking powder. You may also like to add ½ tsp xanthan gum for better texture. Please do check the labels for everything you use to make the cake if you are serving it to someone with an allergy or intolerance.

Can this cake be made dairy free?

For a dairy free version, use a dairy free baking spread for both the cake and buttercream. I recommend Flora Plant or the Stork Baking Block for the buttercream, as they give the best texture. Please do check the labels for everything you use to make the cake if you are serving it to someone with an allergy or intolerance.

More tips for making the Coffee & Walnut Cake:

I used a Wilton 8B piping nozzle for this cake.
You can spread the buttercream onto the cake with a spoon if you don’t want to pipe it.
I don’t recommend baking this cake in one deep tin, as it may not cook evenly. It is best to bake it in two sandwich tins (that are at least 2" deep).

Troubleshooting

If you have any questions about this recipe, or if something went wrong and you need help, please use the comment form below and I will get back to you. You can also get in touch with me on my Twitter, Instagram or Facebook. I'd love to hear from you!

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