1.  Preheat oven to 350 degrees.  In a large mixing bowl, beat together the butter and sugars until well combined.  Add the egg and vanilla and beat again.  Add flour, pudding mix, baking soda, and salt.  Mix until it comes together into a batter.  It will start of dry and crumbly, but keep mixing!  Add the chocolate chips and M&M’s then stir them in gently.
2.  Evenly portion the dough onto the trays.  I used a small cookie scoop, but will try a larger one next time for bigger cookies!  Bake for 10 minutes or until the cookies are just beginning to lightly brown on the edges.  Do not overcook!  Let the cookies cool for 8 minutes before removing them from the cookie sheet.