Preheat the oven to 180°C and lightly grease a baking sheet with butter or non-stick spray.
1. Cookies: Using an electric or hand beater, beat the butter and sugar together until light and fluffy and add the vanilla essence.
2. Add the flour and salt and beat until the dough comes together. Divide into 14-16 equal portions, roll into balls and arrange on the baking sheet. Using your thumb, make a deep indentation in the middle of each cookie. Bake for 15-20 minutes or until pale and golden. Remove from the oven and cool on a wire rack.