Preheat the oven to 165 degrees top and bottom heat. Line a baking sheet with parchment paper. If you are not using a store-bought speculoos spice, mix the ingredients for the spice mixture and place 1 tablespoon ready for the dough.
Pile the flour sifted with the baking powder on the worktop. Make a well in the middle, add the remaining ingredients and quickly work into a smooth ball of dough. If the kneading dough is too cracked and dry, add some milk. If the dough is too sticky and wet, knead in a little flour.
Shape the dough into small balls, slightly smaller than a marble, and place them on the tray with some spacing. Bake the biscuits until crispy and golden brown in 12-15 minutes.
These biscuits are eaten with St. Nicholas and are part of the Strooigoed. Mixed with other sweets (hard sugar foam and Tumtum, a kind of wine gum), the Zwarten Pieten, the helpers from Sinterklaas, sprinkle them and hand them out.