Preheat the oven to gas mark 3 / 165C / 350F.
Line a baking tray using Bakewell baking paper.
In a large bowl add together 120g of brown sugar, 100g of caster sugar with 150g of melted unsalted butter.
Add to this 2 teaspoons of vanilla extract and 1 egg and beat together.
Mix with this 300g of flour and 1 teaspoon of bicarbonate soda. Then add 300g of milk chocolate chips.
Using a 60ml measurer scoop the mixture out on to the lined tray, leaving approximately 2.5 inches between each.
Put tray in the middle of the oven and cook for 15-18 minutes, or until the cookies are lightly browned.
When cooked remove from oven and leave to cool for 3 minutes, then remove and place on a wired rack to cool further.
Repeat steps 6 and 7 for the rest of the mixture and enjoy.