Pre-heat the oven to 175°C (350°F) and line a baking tin with grease-proof paper.

Beat the butter, vanilla sugar and sugar together until nice and fluffy. Add the flour and mix until a dough forms. Place the dough in the fridge for around 30 minutes to firm up a little.

Roll into small balls and press your thumb down in each one making a nice, fairly thick hole.

Bake for around 10 minutes, just until the edges begin to brown. Remove from the oven and then spoon around 1 teaspoon of caramel into the hole of each cookie (if you find that the holes have closed up a little when baking, just use the back of a small spoon to press the cookie down and make the holes larger again). Leave to cool on the tray for around ten minutes and then transfer to a wire rack to cool completely.

Melt the chocolate and then drizzle over the cookies. Enjoy!