Preheat your oven to 190C/180C Fan/375F and line two or three large baking trays with parchment paper, leave to the side!
Mix together the Butter, Light Brown Sugar and Granulated Sugar until light and fluffy and thoroughly combined – using an electric mixer is far easier for this because it gets very fluffy and perfect!
Mix in the Egg, Vanilla Extract, Cocoa powder, Plain Flour, Bicarbonate of Soda, Baking Powder and Salt and beat again until a thick paste/cookie dough is formed.
Fold in the M&Ms and Chocolate Chips and spoon the mixture onto the trays! I use a cookie dropper/ice cream scoop to make them identical sizes.
Make sure they are suitably spread out on the trays so they stay separate! I usually fit 6 on each tray to be safe. Bake in the oven for 10-12 minutes until spread out perfectly crinkly. They might seem slightly under done still, but they will continue to cook when cooling so don’t worry!
Once baked, remove from the oven and leave to cool on the tray for 5 minutes before transferring to a wire rack to continue cooling off completely! Then, gobble them all up!
Notes
They are super super gooey when warm so you could serve them with a dollop of ice cream if you like (vanilla is perfect with it) and they are an utter crowd pleaser.
Any type of M&M will work! I use normal Chocolate M&Ms as they’re my favourite, but your favourite flavour will also work fine! Sometimes the cookies might spread a little if using larger M&Ms like the peanut ones, but they should still be fine after the chilling!
These delicious treats will last about 3 days after baking, but trust me, they won’t last that long!