Baking Instructions

• Preheat your oven to 190C/170C fan and line a 9x9 inch square tin with parchment paper, and leave to the side for now.
• Whisk/Mix the plain flour, bicarbonate, salt, cornflour and cinnamon together so it's evenly distributed – leave to the side.
• In a larger bowl, melt the butter. Add in the two sugars, and whisk for about 2 minutes so the sugar starts to dissolve and the mixture is smooth. Add in the egg and the vanilla, and whisk again briefly until smooth.
• Add in the dry ingredients, all but a handful of the Christmas coloured M&Ms, and the chocolate chips and mix with a spatula until a thick cookie dough is formed.
• Press the mixture into the bottom of the tin and press in the handful of Christmas M&Ms into the top for decoration. Bake the traybake in the oven for 20-25 minutes, until the top of the cookie bake looks ‘dry’!
• Leave the cookie bake to cool for about 10 minutes, then leave to cool fully on a wire rack. Cut the bake into 4x4 for decent sizes, or 5x5 for smaller ones! Enjoy!