Preheat oven to 325F degrees.

Spray the bottom and sides of a 9x13 baking pan with baking spray and line with parchment, spray paper as well.

In a medium bowl, whisk together the flour, baking soda and salt.

In a large bowl, whisk together the sugars, butter until smooth.

Add the eggs and vanilla and whisk until smooth.

Add the flour mixture and combine with a wooden spoon or spatula until all the flour is incorporated.

Fold in the M&M's and chocolate chips.

Evenly spread out dough into baking pan and bake for 25-28 minutes or until the edges begin to brown and the cookie pulls away from the pan.

Allow to cool in the pan completely before cutting.