Chocolate chip cookies

150g butter, at room temperature
80g light brown soft sugar
80g granulated sugar
2 tsp vanilla extract
1 egg
225g plain flour
1/2 tsp bicarbonate of soda
1/4 tsp salt
200g dark chocolate, cut into chunks

Method:
1. Preheat the oven at gas mark 5 (190C/ 170C fan) and line two baking trays with baking sheets.
2. Cream together the butter and sugars in a large bowl. Stir in the egg and vanilla extract. Then sieve the flour, bicarbonate of soda and salt into the bowl and mix everything together. Finally, stir the the chocolate chunks.
3. Using a teaspoon, place small mounds of the cookie dough well apart on the baking trays. Bake in the oven for 8-10 minutes until light brown on the edges and slightly soft in the centre.
4. Once the trays are out of the oven. leave the cookies on them for a few minutes to cool, then transfer onto a cooling rack.