Mix together the self-rising flour, sugar, speculaas spice mix and salt. Add the butter and milk and knead into a firm ball. If the dough is too stiff or dry, add an extra tablespoon of milk.
You can use the dough right away, but it will be tastier if you let it rest in the refrigerator, preferably overnight. It will only improve the flavor.
Roll out the dough on parchment paper, but don't make it too thin. Place the parchment paper and dough on a baking sheet.
Whisk an egg and mix in a little milk. This gives the cookies a nice shine and prevents them from forming sheets, which can happen if you only use egg.
Brush the speculaas with the egg mixture. Garnish the speculaas with the almonds in a pattern of your choice and then coat the speculaas with another layer of egg wash.
Bake for 30 minutes at 170°C/340℉ (conventional oven).
Break the speculaas into pieces after it's cooled and enjoy! Delicious with a cup of tea or coffee, but also delicious on their own.
How to store
Store in an airtight container outside the refrigerator for up to 2 weeks. Keeps fresh in the freezer up to 3 months.