Preheat the oven to 180°C. Line a baking tray with parchment paper.
Cream the butter and sugar until light and smooth.
100 g butter, 100 g sugar
Mix in the vanilla and the light syrup or honey.
1 tsp vanilla extract or 2 tsp vanilla sugar, 1 tbsp light syrup or honey
In a separate bowl, whisk together the flour, cocoa, baking powder, and salt.
¼ cup (25g) unsweetened cocoa powder, 1¼ cups (150g) all-purpose flour, 1 tsp baking powder, A pinch of salt
Add the dry ingredients to the butter mixture and mix until a soft dough forms. If it's too crumbly, add the milk, 1 teaspoon at a time.
1 tbsp milk
Divide the dough in half and roll each portion into a log about 25 cm (10 inches) long.
Place the logs on the baking tray, leaving space between them. Gently flatten each log to about 5 cm (2 inches) wide.
Brush with beaten egg and sprinkle with pearl sugar if using.
1 beaten egg, Pearl sugar or chopped nuts
Bake for 12–14 minutes, until set but still slightly soft in the center.
Let cool for 2–3 minutes, then use a sharp knife to cut the logs diagonally into slices about 2 cm (¾ inch) wide, (the classic “snittar” shape).
Carefully transfer them to a wire rack to cool completely—they'll firm up as they cool.