Chocolate chunk butter cookies

Makes approx 20 cookies

350g Unsalted butter
180g Golden caster sugar
500g Plain flour, sieved
200g Milk chocolate, cut into large chips
Extra sugar for rolling

1. Cream the sugar and butter together until smooth
2. Using a wooden spoon mix in the plain flour & chocolate chunks, then finish mixing with hands until a stiff dough is formed
3. Sprinkle sugar on the surface and roll the dough in it, flattening the sides as you go, making a long rectangular sausage
4. Wrap in clingfilm and refrigerate for 30mins
5. Pre-heat oven to 160C & grease baking trays
6. Slice the dough into 1/2cm slices and lay flat on baking trays
7. Bake for 20mins, then cool on a wire cooling rack
8. Store in an airtight container