Melt the butter and marshmallows

• Add the butter and mini marshmallows to a pan over low-medium heat.
• Stir until completely smooth.

Stir in the Biscoff spread

• Take the pan off the heat and add the Biscoff spread.
• Stir until smooth so it melts in with the residual heat.

Combine with the Rice Krispies

• Pour the Rice Krispies into the pan.
• Mix until every cereal piece is evenly coated.
• Press the mixture into a lined baking dish.

Add the white chocolate topping

• Melt the white chocolate and pour it evenly over the bars.

Drizzle and decorate

• Melt the remaining Biscoff spread and drizzle it over the white chocolate.
• Decorate as desired.

Chill until set

• Pop the dish into the fridge until the topping is firm and the bars set.