Preheat oven to 350 (175C) degrees. Line cookie tray with parchment paper.

Melt butter in microwave for 30-40 seconds until it is in liquid form. In a bowl add butter to sugars and beat until creamy and pale in colour. Add the egg and vanilla extract and beat until egg is just mixed in. Do not over beat, as cookie will become stiff.

Sift flour, baking soda and salt into mixture. With a wooden spoon or spatula mix ingredients together; it should be a crumbly texture. Use hands to knead dough in the bowl so that the mixture creates a ball. Add M&M’s and mix.

Roll the dough into 12 balls and place evenly spaced on cookie tray. Cook in oven for 10-11 mins. They should still be pale in colour with a touch of tan when taken out of oven. Do not over bake. Cool for 30 minutes on tray.