Brown Butter Coffee Walnut Blondies

Brown Butter Coffee Walnut Blondies

Serves 12 330 kcal per serving Prep 20 min Cook 35 min Passive 30 min

Ingredients

  • 180g Unsalted Butter
  • 180g Light Brown Sugar
  • 70g Caster Sugar
  • 2 Large Eggs
  • 1 teaspoon Vanilla Extract
  • 2 tablespoons Instant Espresso Powder
  • 1 tablespoon Boiling Water
  • 220g Plain Flour
  • 1 teaspoon Baking Powder
  • 1/2 teaspoon Fine Sea Salt
  • 120g Walnuts, roughly chopped
  • 80g White Chocolate, roughly chopped

Instructions

  1. Preheat the oven to 180°C and line a 20cm square baking tin with baking paper.
  2. Place the butter in a light-coloured saucepan over medium heat and cook for 5–7 minutes, stirring occasionally, until it foams and the milk solids turn golden brown and smell nutty.
  3. Remove the brown butter from the heat immediately and pour it into a large mixing bowl. Leave to cool for 10 minutes.
  4. Spread the walnuts on a baking tray and toast in the oven for 5–7 minutes until fragrant. Leave to cool, then roughly chop.
  5. Mix the espresso powder with the boiling water until completely dissolved.
  6. Add the brown sugar and caster sugar to the cooled brown butter and whisk until combined.
  7. Add the eggs one at a time, whisking well after each addition.
  8. Whisk in the vanilla extract and dissolved espresso.
  9. In a separate bowl, combine the flour, baking powder, and salt.
  10. Fold the dry ingredients into the brown butter mixture until just combined.
  11. Fold in most of the toasted walnuts and chopped white chocolate, reserving a little of each for the top.
  12. Spoon the batter into the prepared tin and spread it evenly into the corners.
  13. Scatter the reserved walnuts and white chocolate over the surface.
  14. Bake for 24–28 minutes until the edges are golden and set but the centre remains slightly soft.
  15. Leave the blondies to cool completely in the tin before lifting them out using the baking paper.
  16. Cut into 12 squares and serve.

Tips

  • Use a light-coloured saucepan when browning the butter so you can clearly see when the milk solids turn golden and avoid burning them.
  • Remove the blondies from the oven while the centre is still slightly soft. They will continue to set as they cool and retain a chewy texture.
  • Toast the walnuts before adding them to the batter to intensify their flavour and complement the nutty brown butter.

Variations

  • Coffee Pecan Blondies: Replace the walnuts with toasted pecans for a slightly sweeter, buttery nut flavour.
  • Dark Chocolate Coffee Blondies: Replace the white chocolate with roughly chopped dark chocolate for a less sweet and more intense coffee-chocolate combination.

Storage

Store cooled coffee walnut blondies in an airtight container at room temperature for up to 3 days or in the refrigerator for up to 5 days. They can also be frozen for up to 2 months; thaw at room temperature before serving.

Serving Suggestions

  • Serve with freshly brewed coffee or espresso to emphasise the roasted coffee and brown butter flavours.
  • Serve slightly warm with a spoonful of vanilla ice cream for a richer dessert.

Frequently Asked Questions

What is brown butter?

Brown butter is butter that has been gently cooked until its milk solids turn golden brown. This gives it a deeper, toasted and nutty flavour that works particularly well in cakes, cookies, and blondies.

How do I know when blondies are baked?

The edges should be set and lightly golden while the centre remains slightly soft. A skewer inserted into the middle should come out with a few moist crumbs rather than completely clean.

Can I make coffee walnut blondies ahead of time?

Yes. Blondies keep well for several days and their texture remains soft and chewy when stored in an airtight container, making them suitable for baking a day or two before serving.

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