To Make the Cookies

• Line a baking tray with baking parchment or a Tupperware container and leave to one side
• In a bowl cream together the butter and both sugars until pale in colour and fluffy.
• Add in the egg, flour, vanilla, baking powder, bicarbonate of soda and corn flour and mix until completely combined and a dough begins to form.
• Add in the chocolate chips, M&Ms and sprinkles and mix again until they are evenly distributed.
• Weight your cookie dough into balls of around 130-140g and place them on your baking tray or in your Tupperware container.
• Pop them into the freezer for 1 hour.
• Towards the end of the 1-hour freezing time preheat the oven to 200C (180C Fan).
• Remove the cookie dough from the freezer and spread them out on two or three baking sheets. Remember they will spread slightly so you don't want them to be touching.
• Bake in the oven for 13-15 minutes or until they start to go golden brown around the edges.