Add in flour, baking soda, and salt and beat until combined.
Add the chocolate chips and M&M's and stir in by hand.
Using a 1 inch cookie scoop, scoop out the dough and drop onto prepared baking sheet. Bake for 8 minutes or until almost set through the center -- they'll look a little glossy and that's okay.
Remove from oven and let cool several minutes before transferring to a cooling rack to cool.