To get the heart shape you have to start out with a weird "V" shape. When the cookies bake and spread they'll take on the heart shape.
Start with two scoops of cookie dough (I used my regular-sized scoop). Use your fingers to shape each ball of dough into a tear shape and put them on your baking sheet in the shape of a "V". Put some extra M&Ms on the top so they show after baking.