First up, line 2 large baking trays. Pop your butter and sugars into a large bowl and whisk together until smooth and paler in colour.

Pop in the egg and Vanilla Extract and whisk again until smooth. Sieve over the flour, cornflour, Baking Powder and Bicarbonate of Soda and mix until the dough comes together. Finally mix in the Rainbow Chips and Chocolate Chips, leave a handful of rainbow chips to one side.

Divide your cookie dough into 110g pieces and roll into a ball, repeat for each piece of cookie dough and pop onto your lined baking trays spaced well apart. Push your left over Rainbow Chips into the top of your cookies.

Pop your trays of dough into the freezer for 45 minutes. 10 minutes before baking , preheat your oven to 200°C/180°C fan/Gas Mark 6.

Bake your cookies for 18-20 minutes until golden brown. Leave to cool on the tray for 10 minutes and then pop onto a cooling rack. Your cookies are ready to tuck into!