Preheat the oven to 180C (360F) fan forced. Line two baking trays with baking paper.
In a medium bowl, beat the butter, sugar, and vanilla essence until creamy. Stir in the combined sifted flours and mix to form a smooth dough.
Roll 3 tsps. of the dough into balls and place well apart on the trays, make a fairly deep indentation in the centre of each biscuit, and bake for 10-15 minutes, or until lightly golden.
While warm, gently indent the centre again, leave for five minutes, then cool on a wire rack.
To make the caramel topping, place the butter, sugar, and syrup in a saucepan. Stir over a low heat until the sugar dissolves. Add the condensed milk and stir for about 5-10 minutes, or until golden.
Fill the indentation of each biscuit with the caramel and cool.
Melt the chocolate in the microwave, stirring every 15-20 seconds to avoid burning. Then pour about a teaspoon of the melted chocolate on top of the cookies, leaving a small edge of the cookie exposed.
Let the chocolate set completely before serving. This will take about 30 minutes in the fridge or 2-3 hours at room temperature.