Place 15 x ½ teaspoon dollops of Biscoff spread (⅓ cup) onto a baking paper lined tray. Freeze for 15 minutes or until solid.
Cream the Biscoff spread (½ cup), butter and brown sugar with hand-held beaters or a stand mixer on medium/high speed for 3-4 minutes or until pale and creamy. If using a Thermomix: Insert the butterfly into the Thermomix bowl. Add the Biscoff spread (½ cup), butter and brown sugar and mix for 3 minutes, Speed 3 (scraping down the sides occasionally).
Add the egg and vanilla extract and beat again on medium speed until combined.If using a Thermomix: Add the egg and vanilla extract and mix for 1 minute, Speed 3.
Add the plain flour, bi-carb soda and salt and beat on low speed until combined.If using a Thermomix: Remove the butterfly. Add the plain flour, bi-carb soda and salt and mix for 30 seconds, Speed 3. Scrape down the sides of the bowl and mix again for an extra 30 seconds.
Sprinkle the white chocolate chips over the mixture and stir through with a spoon or spatula. Chill the dough in the fridge for 20 minutes.
Preheat oven to 170 degrees celsius (fan-forced). Line 2 large flat baking trays with baking paper and set aside.
Divide the mixture into 15 portions. Flatten each portion and place a frozen dollop of Biscoff in the centre. Roll to enclose. Place onto the prepared trays, leaving a 8cm gap between each dough ball to allow for spreading.
Press a piece of chopped Biscoff biscuit into the top of each dough ball.
Bake for 10-12 minutes or until just ever so slightly golden around the edges (don't overcook). Rotate the trays during cooking.
Leave on the trays for 5 minutes and then transfer to a wire rack to cool completely.
Notes
RECIPE NOTES & TIPS
Freezing small portions of the spread first makes it easier to handle when enclosing inside the cookie dough, and from melting through when baking.
Cream the brown sugar and butter until well combined, but don't overbeat. Excess beating can soften the butter too much, particularly in warmer weather.
Chilling the dough makes it easier to handle when rolling, and helps to prevent the cookies from spreadingtoo much once baking.
You want uniform size so that they bake evenly, so try measuring out your dough balls.
Ensure you leave a large gap (about 8 cm) between the cookies on the baking tray as they will spread.
Keep a good eye of these cookies as they bake, you don't want to overbake them as you want them to remain soft. Rotate the trays when baking.
Storing - Biscoff cookies can be stored in an airtight container at room temperature for up to a week.
Freezing - the unbaked dough can be rolled into a ball and covered in plastic wrap. Freeze for up to 3 months. The baked cookies can be frozen in an airtight container (with layers of baking/parchment paper between each layer) for up to 1 month.