Line a 9 inch x 9 inch square pan with parchment paper.

In a large pot or saucepan over medium heat, melt the butter.

Once all melted, add the vanilla extract and mix.

Then add all the marshmallows. Continue to mix until the marshmallows have melted into the butter and you no longer see any clumps.

Pour in the cereal and crushed biscoff cookies and stir until it is all evenly incorporated.

Take off the heat, transfer to the pan and use a rubber spatula to quickly and gently spread out evenly in the pan. Do not pack it in too tight or they won't be fluffy! If it is sticking too much, just dab a little water on the spatula or your fingers and it does the trick.

Melt the chocolate according to package directions in the microwave or using a double boiler. Spread on top of the Rice Krispies treats in a thin layer. Drizzle the biscoff spread in lines across one direction. Then take a toothpick and drag it through in alternating opposite directions to create the design. Sprinkle more crumbled biscoff on top if you'd like.

Pop in the fridge for 15 to 20 minutes or until the chocolate is set and hard upon touch.

Cut into 16 squares and if you'd like, press the bottom into more biscoff crumbs. Then enjoy!