Preheat the oven to 180°C(350°F)..
In a mixing bowl add in butter, sugar, egg, vanilla and mix well.
Add in flour, baking powder, baking soda and mix well.
Throw in the M&M chocolate chips and mix well.Set this in fridge for 15 min.
Divide this into equal balls, place this in a parchment lined baking tray.Leave space between each other..
Bake this for about 15-20 min ..Check it often,It should be light golden on top..
Take it out of the oven and cool it in wire rack.
After it has cooled completely,keep this in a air tight container...Enjoy with a cup of milk..