Preheat oven to 375 degrees.
In a medium bowl, combine flour, baking soda and salt. Set aside.
In a large bowl, beat the softened butter, sugar, brown sugar and vanilla extract until creamy. Beat in eggs. .Gradually blend the flour mixture into the butter mixture.
Stir in chocolate chips and M&Ms.
Scoop up a tablespoon (approximately) and shape into a ball. Place on cookie sheet and flatten slightly.
Bake for 9-11 minutes. Transfer to a wire rack and cool completely. Store in an airtight container.