Preheat the oven to 350F (175C).

In a large bowl, combine flour, brown sugar, baking powder, vanilla sugar, cinnamon, nutmeg, and salt.

Melt the butter and add it to the dry ingredients. Mix well.

Add the egg and stir to combine. If the dough is too dry, add a few tablespoons of milk until it comes together.

Form the dough into a ball and refrigerate for 30 minutes to 1 hour.

On a lightly floured surface, roll out the dough to about 1/4 inch thickness.

Cut the dough into rectangular-shaped biscuits using a knife or cookie cutter.

Place the biscuits on a baking sheet lined with greaseproof paper.

Bake for about 20 minutes, or until golden brown and crispy.

Let the biscuits cool completely on a wire rack before serving.