Preheat the oven to 180C/160C Fan and line two/three large baking trays with parchment paper, leave to the side.
Whisk the Plain Flour, Bicarbonate of Soda, Salt, Cornflour and Pumpkin Spice Mix together in a bowl and leave to the side.
Melt your butter carefully, and then add to a bowl. Add in the Sugars, and whisk the mixture together for two minutes. (I used my electric whisk, if whisking by hand, whisk for 3 minutes)
Add in the Vanilla and Egg and whisk again till combined.
Add in the flour mixture, Chocolate Chips and Orange/Pumpkin/Halloween M&Ms and beat till everything is evenly distributed and a cookie dough is formed.
Scoop the cookie dough using a cookie scoop for even portions, then roll into balls. Bake in the oven for 10-13 minutes.
Leave the cookies to cool on the trays for 5 minutes, then transfer to a rack to cool completely! Enjoy!
You don’t have to use the Pumpkin Spice Mix if you don’t want to – you can just leave it out, or even just use little less if you’re not sure.
I used Orange M&Ms as when I baked these and photographed them, I had eaten the Pumpkin ones that someone had bought for me. Occasionally M&Ms do ‘special bags’ of Halloween M&Ms so they’d also be good to use.
These cookies can last for three days easily, but they rarely do in my house!
You can easily bake these into cookie bars by following the same method, but baking into a 9″ square tin, and baking for 20-25 minutes at the same temperature!