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Coffee walnut box cake: The classic café pastry for home

Cakes · March 28, 2026 · 8 min read · 75 min total

Coffee walnut box cake: The classic café pastry for home is a cakes recipe, about 75 minutes total, yielding 8-10 pieces, easy difficulty.

A golden brown coffee and walnut loaf cake decorated with coffee buttercream and walnut halves.

The humble coffee walnut loaf cake is a classic in British bakeries and is also loved by home bakers everywhere. Its aromatic coffee taste and crunchy walnuts make it the perfect companion for a hot cup of tea or coffee.

This recipe is uncomplicated and consists of just a few steps - so you can conjure up a cozy cake in no time at all that is guaranteed to be eaten quickly. Especially if you top it off with a generous layer of coffee buttercream.

Ingredients for coffee walnut box cake: eggs, butter, sugar, flour, espresso powder, walnuts and milk on a wooden countertop.
All the important ingredients for a perfect coffee walnut cake.

The right choice of coffee

Instant espresso powder provides a strong coffee flavor without adding too much liquid to the dough. If you prefer it milder, you can also use regular instant coffee - just dissolve it beforehand and then add it to the dough.

Hand mixes chopped walnuts into coffee cake batter in a bowl.
Chopped walnuts are folded into the aromatic dough.

Nutty extras

Coarsely chopped walnut pieces give each piece a pleasant bite. For even more flavor, you can lightly toast the nuts beforehand and save a few nice halves for decoration.

A golden brown coffee and walnut loaf cake cools on a rack.
The cake cools down and fills the kitchen with the smell of coffee.

The cake remains particularly tender thanks to butter and light brown sugar. Be careful not to mix the dough for too long after adding the flour so that the cake stays nice and fluffy. A hint of vanilla rounds off the aroma.

A piece of coffee-walnut box cake with coffee buttercream and a walnut half on a plate.
A piece of cake ready to enjoy with your favorite drink.

Let the cake cool completely before spreading it with a creamy coffee buttercream and arranging the walnut halves on top for the classic look.

Recipe

Ingredients

  • 175 g soft butter (unsalted)
  • 175g light brown sugar
  • 3 large eggs
  • 160 g self-baking flour
  • 1 tsp baking powder
  • 2 tbsp instant espresso powder
  • 2 tbsp milk
  • 1 tsp vanilla extract
  • 80g walnut pieces, plus 8-10 halves for decoration
  • pinch of salt
  • 100 g butter (unsalted, for the buttercream)
  • 200 g powdered sugar, sifted
  • 2 tsp instant espresso powder (for the buttercream)
  • 1 tbsp milk (for the buttercream)

Method

  1. Preheat the oven to 170 °C top/bottom heat (150 °C fan oven). Grease a loaf pan (approx. 900 g) and line it with baking paper.
  2. Dissolve the espresso powder in 2 tablespoons of milk.
  3. Beat butter and sugar until light and creamy. Add the eggs one at a time, stirring well after each egg.
  4. Stir in the dissolved coffee and vanilla extract.
  5. Sift in the flour, baking powder and salt and fold them in carefully until a dough just forms. Fold in the walnut pieces.
  6. Pour the dough into the mold and smooth the surface. Bake the cake for 45-50 minutes until a wooden pick comes out clean.
  7. Let the cake cool in the pan for 5 minutes, then turn it out onto a wire rack and let it cool completely.
  8. For the buttercream: Dissolve the espresso powder in 1 tablespoon of milk. Beat the butter until light and creamy, then gradually stir in the powdered sugar and dissolved coffee until you get a smooth cream.
  9. Spread the buttercream over the cooled cake and decorate with the walnut halves.