Preheat the oven to gas mark 6 or 200 degrees Celsius.
In a large bowl, mix together the butter, sugar and golden syrup.Add the egg, plain flour and baking powder and mix well until it forms a dough.
Mix the milk chocolate chips into the cookie dough ensuring they are spread throughout.
Place the dough into a 20cm x 20cm tin and flatten evenly. Sprinkle with a few leftover chocolate chips.
Bake for 20-25 minutes or until golden.
Leave to cool in the tin, then once cool, cut into 9 bars to serve.