Preheat oven to 215 celsius or 420 fahrenheit and line a 12 hole muffin tin with muffin papers (I use the unbleached tulip cases, but regular cupcake cases are fine)
Place the Biscoff spread into a medium-large heatproof bowl, then microwave it for 15 seconds -you just want to soften it, not melt it.
Now add the sugars and oil and use a balloon whisk to whisk until smooth
Whisk in the eggs, then the buttermilk and vanilla
In a separate bowl, combine the flour, baking soda and powder, as well as the Speculaas spice, then pour it into the bowl containing the wet ingredients.
Use a silicone spatula to gently fold through the dry ingredients until almost combined.
Add the white chocolate chips and fold through until just combined.
Use a large cookie scoop to fill the muffin liners about 3/4 full. I use 1 1/2 scoops per muffin, yielding 12 beautiful muffins
Crush the biscoff biscuits and sprinkle the crumbs over the top of each muffin, being sure to leave some chunks in there as well
Bake in your preheated oven for 7 minutes, then reduce the heat to 180 celsius or 350 fahrenheit and bake for another 15 minutes, until golden. Insert a cake tester in the centre of the muffin to make sure they’re done
Remove from the oven and allow to cool in the muffin pan, before cooling on a wire rack