Set the oven to 190. Beat the butter with both sugars until creamy

Break the egg and beat it into the mixture until smooth. Then add the vanilla essence and mix it in

Add flour, salt and bicarb to the mixture, a little at a time, and stir everything together

Now add the chocolate and stir them until they are evenly spread though the mixture

Butter the baking trays and spoon small mounds of mixture onto them, leaving quite big spaces between the mounds

Bake the cookie for 10-12 mins until they are even golden brown, then move them on to a wire rack to cool.