Fifteen Brownie Roll
Imported from TikTok
30 minMedium8 servings

Fifteen Brownie Roll

A decadent layer of traditional Northern Irish Fifteen mixture rolled inside a fudgy brownie base and coated in melted chocolate.

Mise turned a cooking video on TikTok into this written step-by-step recipe — 4 ingredients, 6 steps, 30 min, with a generated photo for every step.

Cook step-by-step in Mise → Free · iPhone
Time30min
LevelMedium
Servings8
Method 6 steps
01

Lay out a large rectangular sheet of prepared fudgy brownie base on a piece of parchment paper.

02

Sprinkle desiccated coconut evenly over the brownie base.

03

Spread a layer of the prepared Fifteen mixture evenly over the coconut-dusted brownie base, pressing it down gently.

04

Using the parchment paper for support, tightly roll the brownie and filling into a uniform log shape.

05

Place the rolled log on a tray and pour melted chocolate over the top until completely coated.

06

Allow the chocolate to set, then slice into thick rounds to serve.

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Notes

The Fifteen brownie roll combines the rich, dense texture of a chocolate brownie with the classic Northern Irish traybake traditionally consisting of digestive biscuits and marshmallows. This fusion dessert transforms two distinct textures into a single cohesive log, where the brownie acts as a flexible casing for the chewy, creamy interior. The desiccated coconut provides a fine barrier that prevents the filling from soaking into the base, ensuring each layer remains distinct. Expect a heavy, sweet slice that balances the cocoa depth of the brownie against the milky sweetness of the condensed milk filling.

Successful execution relies on the temperature of the brownie base and the pressure used during the rolling process. This dish is suited for afternoon tea or as a heavy dessert served at room temperature. The melted chocolate coating provides a crisp snap that contrasts with the soft center, creating a professional finish that hides the spiral assembly. It is a substantial treat that requires only small portions to satisfy.

Before you start

  • Ensure the brownie base is completely cooled but still pliable before rolling to prevent the cake from cracking or tearing during the third step.
  • Spread the Fifteen mixture within one inch of the edges to prevent the filling from squeezing out the sides when you begin the tight rolling process.
  • Use the parchment paper as a guide to apply even pressure across the entire length of the log, creating a dense spiral without any air pockets.
  • Chill the rolled log for twenty minutes before applying the melted chocolate coating to ensure the topping sets quickly and maintains a smooth, glossy finish.

Swaps that work

  • Replace melted chocolate with an equal amount of white chocolate for a sweeter profile and a stark visual contrast against the dark brownie base.
  • Substitute desiccated coconut with the same quantity of finely crushed graham crackers if you prefer a crunchier texture and want to avoid coconut flavor.
  • Use gluten-free digestive biscuits in the Fifteen mixture to make the filling suitable for those with gluten sensitivities while maintaining the original chewy texture.

Keeping it

Store the brownie roll in an airtight container in the refrigerator for up to five days. The condensed milk and marshmallow filling stays moist when chilled, though the chocolate coating may lose some shine. For the best texture, remove from the fridge thirty minutes before serving to let the brownie soften. This dish freezes well for up to three months if wrapped tightly in plastic wrap and foil; thaw in the refrigerator overnight.

Questions

Can I make this dessert a day in advance?

Yes, preparing this dish twenty-four hours ahead is recommended. It allows the flavors in the filling to meld and ensures the chocolate coating is fully set. Keep the roll whole in the refrigerator and slice it just before serving to maintain the cleanest appearance for each round.

Why did my brownie roll crack during the rolling process?

Cracking occurs if the brownie base is too dry or too cold. If the brownie was overbaked, it loses the moisture needed for flexibility. To fix a cracked roll, use the melted chocolate coating to fill and hide the fissures; the chocolate will act as a structural adhesive.

Does the Fifteen mixture need to be refrigerated before spreading?

The mixture should be room temperature when spreading it onto the brownie. If it is too cold, it will be too stiff to spread evenly and may tear the brownie base. If it is too warm, it will be runny and leak out during the rolling step.

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