Step 1

Preheat your oven to 190C/170C fan, and line a 9x9inch square tin with parchment paper, and leave to the side for now.

Step 2

Whisk together the Plain Flour, Bicarbonate of Soda, Salt and Cornflour together in a bowl and leave to the side for now.

Step 3

Melt the Unsalted Butter till liquid, and add to a bowl. Add in the Light Brown Sugar and Granulated Sugar and whisk the mixture together for two minutes by an electric whisk, 3 minutes by hand.

Step 4

Add in the Egg and Vanilla and whisk again till they're combined in.

Step 5

Add in the mixed together Dry Ingredients and mix until a really thick cookie dough is formed.

Step 6

Add in the chopped Kinder Chocolate, and chopped Kinder Bueno, and fold through. Reserve some of the Kinder Chocolate for the top of the Cookie Bars.

Step 7

Push the mixture into the 9x9inch Tin, and add on the last few bits of Kinder Goodness.

Step 8

Bake the Cookie Bars in the oven for 17-22 minutes. I usually do 19 minutes so they stay reasonably gooey.

Step 9

Once baked, leave in the tin for 10 minutes to cool a bit, and then remove and cool fully on the wire rack. Enjoy!