Fudgy Bourbon Biscuit Brownies

Fudgy Bourbon Biscuit Brownies

Gooey dark chocolate brownies filled with crushed bourbon biscuits. This bourbon brownie recipe will be a treat for any lover of these traditional British biscuits, especially with the perfectly fudgy centre. 

Close-up of bourbon cookies arranged in a pattern on a wooden surface.
Orange digital thermometer on a white surface with brownies in the background
Ingredients
  • 200g dark chocolate
  • 100g dark brown sugar
  • 200g white or granulated sugar
  • 250g unsalted butter (ideally at room temperature)
  • 3 medium eggs
  • 50g cocoa powder
  • 75g plain flour
  • Pinch of salt
  • ½ tsp baking powder
  • 13 bourbon brownies

You will also need a baking tin (we used a 23 x 23 cm brownie tin)

Directions
  • Preheat your oven to 180 °C.
  • Weigh out your sugar and put it into a mixing bowl.
  • Cut the butter into small cubes to make it easier to mix and add to the bowl.
  • Using a blender or food mixer, mix these until you have a creamy texture, and all the sugar and butter are combined.
  • Once blended, add 1 egg and mix again. Repeat for the remaining eggs.
  • Melt your chocolate. Using a bain marie is the best method as it allows much better control of the temperature of the chocolate.
  • Whilst the chocolate starts to melt, weigh out the flour, cocoa, salt, and baking powder. Give this a little mix to combine the ingredients.
  • Once the dry ingredients are combined, start stirring the chocolate. Dark chocolate should not exceed 32 °C, so make sure to keep stirring to prevent hot spots.
  • Keep checking the temperature with your Thermapen. Once the chocolate reaches 32 °C, remove from the heat and continue to stir. Not all the chocolate will have melted at this temperature but keep stirring, and it will melt.
Digital thermometer measuring the temperature of melted chocolate in a bowl.
Person pouring chocolate into a bowl with cookies on a kitchen counter.
Person using a digital thermometer to check the temperature of brownies in an oven.
Stack of chocolate brownies on a white plate with a light gray background
  • When all the chocolate has been added, pour in some of the flour and cocoa mix and fold. Again, add one-third at a time.
  • After all the flour mixture has been added, break up 5 bourbon biscuits and fold them into the brownie mix.
  • Lightly oil a baking tin and add the brownie mix to the tin. Spread the mix evenly across the tin.
  • Cut the remaining 8 bourbon biscuits in half and place on top of the mixture.
  • Put the brownie mix in the oven at 180°C for 30-35 minutes.
  • Check the internal temperature using your Thermapen. You’re looking for 82 °C for perfectly fudgy brownies.
  • Leave to cool in the tin for two hours. Move to the fridge for a few hours and then slice into even pieces.

Thermapen Food Thermometer Probes

Thermapen® ONE Thermometer

Thermapen® ONE Thermometer

Thermapen® ONE Thermometer

Sale price  £63.00 Regular price  £78.00
Thermapen® ONE Limited Edition Colours

Thermapen® ONE Limited Edition Colours

Thermapen® ONE Limited Edition Colours

Sale price  £63.00 Regular price  £78.00
Thermapen® Classic Thermometer

Thermapen® Classic Thermometer

Thermapen® Classic Thermometer

£52.80
Polka Dot Thermapen® ONE

Polka Dot Thermapen® ONE

Polka Dot Thermapen® ONE

£78.00
Team Temperature Thermapen® ONE

Team Temperature Thermapen® ONE

Team Temperature Thermapen® ONE

£78.00
RFX Thermapen ONE Kit

RFX Thermapen ONE Kit

RFX Thermapen ONE Kit

£268.80
RFX Thermapen Classic Kit

RFX Thermapen Classic Kit

RFX Thermapen Classic Kit

£255.34
Black Thermapen Classic Set

Black Thermapen Classic Set

Black Thermapen Classic Set

£63.60