step 1
Preheat the oven to 180°C, 350°F, Gas Mark 4. Then line baking trays with grease proof paper.
step 2
Cream the butter, sugar and vanilla extract together until thick and fluffy. Beat in the egg gradually.
step 3
Fold in the flour and salt. Then add the chocolate chunks and stir in to the mixture.
step 4
Place spoonfuls of the mixture on to the baking trays. Place in the preheated oven and bake for about 15 minutes.
step 5
Leave to cool on the baking sheets for a few minutes before transferring to a wire rack. When cold, store in an airtight tin in a cool place.