Line a 9″ square tin with parchment paper and set it aside for later use.
Add broken white chocolate to a large mixing bowl and melt on a low to medium heat. Microwave for short sections (10 to 15 seconds) and stir the mixture each time until fully melted.You can also melt the chocolate in a pan over a low heat, stirring continuously.
Add Biscoff spread to a small microwaveable bowl and melt in the microwave on a medium heat for 30 seconds or until runny.
Stir the melted Biscoff spread and pour it into the melted white chocolate and mix until combined.
Add the mini marshmallows and broken Biscoff biscuits into the chocolate mixture and mix together until evenly distributed.
Pour the Biscoff mixture into the lined baking tin and spread it evenly into all four corners. With the back of a spoon, press the mixture down.
Rocky Road Topping
Melt Biscoff spread in the microwave on a medium heat until melted. With a spoon, drizzle it over the rocky road mixture.
Break the remaining Lotus Biscoff biscuits in half or into small pieces and place it on top of the melted Biscoff spread.
Leave the rocky road in the fridge to chill for 1 to 2 hours or until set. Once set, cut into slices.